About previous 5.12.4 release

5.12.4 is a major official release that includes all updates from 5.5.8 (current official release) and earlier versions, along with new features, enhancements, and bug fixes.

New features introduced in version 5.12.4.

7. Amazon WorkSpaces Client integration (version 2024.2.4987).
8. Added support for Microsoft Entra Single Sign-On (SSO) for Azure Virtual Desktop (AVD) authentication.
9. Enabled support for smart card authentication with Microsoft SSO to AVD.
10. Microsoft Teams PWA (Progressive Web Application) support replacing the discontinued Microsoft Teams Linux app (EOL).
11. Ability to use VDI clients to control access to LEAF OS applications.
12. Touchscreen identification tool for dual touchscreen setups.
13. Support for the enhanced ‘UXP Turbo’ protocol with the advanced H.264 codec in vSpace sessions (requires vSpace Pro Enterprise version 12.9.1 or higher), delivering improved compression, reduced bandwidth usage, and lower latency, making it ideal for:

2. vSpace Server access over WAN or VPN
3. Applications requiring low network latency, such as CAD systems which need to render and animate 3D objects. 

The UXP Turbo with the H.264 support in vSpace brings next-generation performance for vSpace Pro Enterprise servers running on Windows 10, Windows 11, Windows Server 2022, or Windows Server 2025.

8. Option to remember the last logged-in user name in Omnissa Horizon Client.

New enhancements introduced in version 5.12.4: 

13. Linux kernel updated to version 6.6 with new drivers for enhanced x86-64 hardware compatibility.
14. NComputing EX500W thin client model support.
15. Microsoft AVD Client App updated to version 3 of Microsoft SDK.
16. Citrix Workspace app updated to version 2408.
17. Omnissa Horizon Client updated to version 2406.
18. Allow High Definition Color (may reduce performance) option under Blast Settings in the Omnissa Horizon client configuration.
19. VERDE VDI Client updated with Secure Browser support.
20. When kiosk mode is configured, continuing the auto-connect loop when encountering RDP connection errors (e.g. host machine not yet ready while powering up).
21. Support for AVC444 decoding at resolutions higher than 1080P in RDP sessions. 
22. RDP Shortpath support added to RDP Client (AVD client type needs to be selected).
23. Enhanced vCAST components for improved compatibility and optimized performance with full HD video content in vSpace and RDP sessions.
24. Improved video and audio synchronization of vCAST-ed content in vSpace and RDP sessions.
25. New options in vSpace Pro device connection settings to enable/disable ‘UXP Turbo protocol’ and ‘H.264 decoding’ capabilities. 

These options provide the flexibility of being able to globally enable the H.264 encoding in vSpace Server (requiring higher CPU/GPU load), but disable the H.264 support on selected clients when not required. 

21. Improved handling of Kiosk Mode parameters, based on the application type.
22. Ability to bypass the HTTP proxy when establishing management connection to PMC Endpoint Manager (e.g., when deployed on-prem), while using the configured HTTP proxy for other network connections (e.g., VDI or VPN connections through the Internet).
23. PIV smartcard authentication support added to local Chromium browser.
24. Update device system time after login to Enterprise 802.1x network.
25. Improved the Ethernet reconnection process when using Enterprise (802.1x) security.
26. Keep users logged into Enterprise (802.1x) networks when waking the device from sleep mode.
27. Binaries of an on-screen (virtual) keyboard for touch monitors added to base LEAF OS image.
28. Device AMP (software maintenance) status icon.

Issues fixed in version 5.12.4:

10. LEAF-1763 – Resolved AVD Client crashes occurring when the AAC audio codec is in use.
11. LEAF-1734 – Resolved the issue where Omnissa Horizon resources failed to auto-launch through Kiosk settings. 
12. LEAF-1688 – Resolved the issue where native USB printer redirection did not work in Citrix sessions. 
13. LEAF-1696 -Resolved the issue with smart card pre-session authentication failing in RDP sessions.
14. LEAF-1765 – Fixed a green strip artifact on the right side of the screen during AVD sessions with hardware-accelerated H.264 decoding.
15. LEAF-1731 – Resolved the issue with the screen lock ‘disconnect’ button being inaccessible when the secondary screen is left of the primary.
16. LEAF-1729 – Resolved the issue where screen mirroring failed after reboot when the primary and secondary displays had different resolutions.
17. LEAF-1745 – Fixed a memory leak issue occurring after launching multiple applications over an extended period. 
18. LEAF-1840 – Fixed a cosmetic bug where the VPN status icon sometimes displayed an ‘unknown’ IP address, even though an IP address has been obtained. 
19. LEAF-1815 – Fixed an issue where Ethernet hot-plug not detected after changing Ethernet security from Enterprise 802.1x to Open. 

About previous 5.5.8 release

The following are the product features introduced in LEAF OS version 5.5.8.

1. LEAF OS workspace UI/UX enhancements:

4. The ability to define a collection of applications, such as VDI clients (AVD, Citrix, RDP, Omnissa Horizon, VERDE, vSpace), web browsers, collaboration applications (Microsoft Teams, Zoom Meetings), and custom Linux applications, all aggregated in the LEAF OS desktop to create a unified user workspace. Please refer to this KB article for more details on the new LEAF OS workspace concept.
5. Ability to present the icons of LEAF OS applications and the icons of published resources (published Citrix, AVD, RDP/RemoteApp, or VERDE VDI applications or desktops) on LEAF OS desktop. 
6. Ability to rescale the LEAF OS desktop and selected applications (including the desktop sessions of RDP and AVD client applications).
7. Enhanced display settings to allow selection of built-in NComputing wallpapers.
   
   

LEAF OS screenshot based on the ‘NComputing 3’ desktop wallpaper.

8. Support for Windows 365 Frontline (selectable as yet another release type in AVD client settings).
9. Ability to use Generic Files to distribute OpenVPN configurations.
10. Option to automatically launch the published Citrix, AVD, RDP/RemoteApp, or VERDE VDI resource (application or desktop) when only one resource is published.
11. Ability to automatically launch the Citrix resource specified in Kiosk Mode settings.
12. Option to automatically logoff the user on the exit of last Citrix, AVD, RDP/RemoteApp, or VERDE VDI session.
13. Mouse settings (pointer speed and left-handed option).
14. The IBus (Intelligent Input Bus) component, to allow keyboard input in Asian languages in local applications.

Following are the enhancements in 5.5.8: 

19. Speeded up LEAF OS boot time by an average of 25 to 35 percent, depending on the device hardware platform.
20. Added LEAF OS support for third-party hardware with NVIDIA GPUs.
21. Upgraded Linux Kernel and added various new drivers for x86-64 hardware device compatibilities.
22. Updated Citrix Workspace App to version 2311.
23. Updated local Chromium browser to version 101.0.4951.64
24. Updated local Zoom Linux application to version 5.16.10.
25. Updated vCAST Streaming software components for vSpace and RDP connections.
26. Retained DHCP leases for Ethernet and Wi-Fi interface after a device reboot.
27. Added ability to adjust real time clock (BIOS clock) for repurposed LEAF OS devices.
28. Display additional Wi-Fi frequency info in the Wi-Fi tool tip.
29. Improved local Chromium browser bookmarks editing UI.
30. Improved monitor hot-plug support.
31. Improved automatic audio input (microphone) selection when both – a USB headsets with microphone and a webcam with microphone are connected; USB headset will be the default and will have higher priority.
32. Improved 'Installation' UI for LEAF OS device repurposing.
33. Improved detection of incorrect date/time settings during AVD authentication.
34. Improved support for 3-monitor displays.
35. Prevented the launching of multiple AVD instances of the same RemoteApp/Remote Desktop while it is loading.
36. Added Proton smart card driver.
37. Added support to use 'Esc' key to close LEAF OS GUI dialogs.

The following LEAF OS issues have been fixed in version 5.5.8:

33. LEAF-1341: Fixed the issue of generic USB redirection not working in AVD (audio, serial ports, scanners) in AVD session.
34. LEAF-1390: Fixed the problem with native redirection of the microphone not working in AVD session.
35. LEAF-1566 - Fixed occasional 'No Internet detected' message when the AVD client is provisioned with auto-launch and auto-logon mode.
36. LEAF-1586 - Fixed the issue where AVD auto-logon sometimes fails when waking up from screen saver mode.
37. LEAF-1344: Resolved the issue where the auto-start of RemoteApp resources in the RDP session does not work.
38. LEAF-1345: Resolved the issue of duplicated RDP logon prompts appearing when PMC Endpoint Manager sends configuration with the 'default' USB redirection policy.
39. LEAF OS-1490: Fixed the vSpace session black screen issue when dual displays are configured in mirror mode.
40. LEAF OS-1382: Fixed the issue where generic audio redirection is used in vSpace or AVD sessions; occasionally, the headset disappears from the audio output list after logging off the session.
41. LEAF OS-1360: Resolved the issue with generic USB redirection support in the VERDE client.
42. LEAF OS-1667: Fixed the issue where the desktop session placement selection for dual displays was not working correctly for the VERDE client.
43. LEAF-1569 - Resolved incorrect Wi-Fi system tray icon status for a disconnected access point.
44. LEAF-1558 - Fixed incorrect Wi-Fi signal strength display for the external Wi-Fi card TP-Link WN725N.
45. LEAF-1587 - Resolved Ethernet reconnection issue when the Ethernet cable was unplugged prior to sleep mode and re-plugged while the device was in sleep mode.
46. LEAF-1564 - Fixed screen saver issue when there are 3 or 4 monitors connected. The fix resolved the issue where the 3rd and 4th monitor cannot be turned off/on in screen saver mode.

About previous 4.11.2 release

Following are the new product features introduced in LEAF OS version 4.11.2

34. The LEAF OS workspace concept

11. Ability to define a collection of applications, like VDI clients (AVD, Citrix, RDP, VERDE, vSpace), web browsers, collaboration applications (Microsoft Teams, Zoom Meetings), as well as custom Linux applications, all aggregated in the LEAF OS desktop to create a user workspace. 
12. Ability to easily launch and multitask with different applications using the new 'Start' menu, the optional LEAF OS applications list, and the system taskbar.
13. Improved user productivity and flexibility thanks to the possibility to launch and toggle between multiple instances of the applications (e.g. Citrix Workspace app, AVD client, RDP client, vSpace client, VERDE VDI client, local browser, etc.) with the ability to launch multiple concurrent user sessions from each VDI client application.
14. New first-time Setup Wizard for quicker and easier local setup; LEAF OS device can also be automatically provisioned remotely by PMC Endpoint Manager.
15. Smart mapping of the previous LEAF OS operation mode to the new LEAF OS workspace metaphor, to ensure continuity in the user experience after LEAF OS software upgrade.
16. Video Tutorial: Setup LEAF OS for Single Operation Mode
17. Video Tutorial: Optimize multitasking with Multi-Application Setup

1. Omnissa Horizon Client for Linux integration – new features include:

9. Omnissa Blast & RDP protocol support
10. Omnissa Blast H.264 Decoding
11. Microsoft Teams Optimization
12. HTML5 Multimedia Redirection (HTML5 MMR) & Browser Content Redirection support
13. Multimedia Redirection (MMR) support
14. Dual display with independent screen rotation
15. Desktop Viewer Toolbar support
16. Guest mode and auto-launch support
17. Support for peripheral devices:

9. USB webcams
10. USB and network printers
11. Document scanner
12. USB mass storage devices
13. Digital (HDMI, DisplayPort, S/PDIF), analog, USB, and Bluetooth audio
14. USB smart card readers and security keys
15. Serial ports
16. Other USB devices through Generic USB redirection

1. Custom parameter support for Omnissa Horizon Client

A semicolon-separated list of custom parameters can be provided for the Omnissa Horizon Client. Custom parameters can be used to extend the command line of the Omnissa Horizon Client executable (of the ‘Omnissa-view’ program) or to modify some Omnissa Horizon Client’s configuration files. 

The syntax of each Omnissa custom parameter must be one of the following:

Destination:         Omnissa-view command line

Parameter syntax:    arg:cmdline_parameter    

Example:        arg:--launchMinimized

Destination:         /etc/Omnissa/config file

Parameter syntax:    config:parameter_name=parameter_value

Example:        config:RemoteDisplay.AllowAudio = "false"

Destination:        /etc/Omnissa/viewagent-custom.conf file

Parameter syntax:    viewagent-custom.conf:parameter_name=parameter_value

Example:        viewagent-custom.conf:BlastProxy.log.logLevel = 'verbose'

Destination:        $HOME/.Omnissa/view-preferences file 

Parameter syntax:    view-preferences:parameter_name=parameter_value

Example:        view-preferences:view.enableHEVC = 'FALSE'

10. ‘Lock screen’ – an additional selectable screen saver action

With the Lock screen option selected as one of the extended screen saver actions, the device screens will be locked when the screen saver is activated after the defined user inactivity timeout. Users will be able to unlock the screens by re-entering the password entered initially during VDI authentication.

To configure the ‘Lock screen’ feature, go to Settings > Display > Screen Saver and select the Lock screen option under Actions.

11. Selectable application exit actions

The following actions can be executed on application exit:

5. no action,
6. restarting the application,
7. putting the device into sleep mode,
8. rebooting the device,
9. shutting down the device.

The ‘Action on exit’ feature can be configured for each application under Setting > Applications > (select an application) > Edit > General.

12. Configurable power button custom actions

The LEAF OS device can be configured to execute the following actions when the user will press the power button:

4. entering the sleep mode,
5. shutting down,
6. rebooting,
7. not performing any action.

The actions can be executed immediately or postponed for a specified period of time, when a pop-up message with a countdown counter will be displayed allowing the user to cancel the action or to select a different one.

To configure the ‘Power button actions’, go to Settings > Management > Power Button Actions.

5. Touchscreen support for AVD and Windows 365 sessions.
6. Added support for extra mouse buttons (more than 3 action buttons) in AVD sessions.
7. Launch and access multiple RemoteApps in AVD sessions.
8. "Clipboard redirection" support for AVD and Windows 365 clients (can be disabled in AVD settings).
9. Local printing support for local applications (e.g., Chromium browser) in LEAFOS.

For each defined local printer, an additional instance of the same printer gets created with the '_local' suffix appended to the name. For this additional printer, based on the specified Windows Printer Driver Name, LEAF OS tries to find a suitable Linux printer driver. With that, the local LEAF OS applications (especially the Chromium web browser) should be able to print. In Chromium, using the ‘See more…’ options in Printing dialog may be necessary to find the additional local printer:

In the example above, the 'HPDJ_5520' printer was defined in LEAF OS configuration. This caused the creation of two Linux printers: HPDJ_5520 (driverless, to be used in Citrix, AVD, and RDP sessions only) and HPDJ_5520_local (with Linux driver configured, to be used in Chromium browser, Omnissa Horizon Client, and other local applications).

6. Custom Chromium browser policy support in LEAFOS (Apply in Chromium application -> Application Settings -> Policy customization file).

Following are the enhancements in 4.11.2: 

9. Updated to new versions of AVD SDK (version 11032023) and AVD software dependency components.
10. Revised AVD release label to match official naming; the "AVD Spring 2020" release is relabeled as "AVD ARM-based" release, and the "AVD Fall 2019" release is relabeled as "AVD Classic" release.
11. Added a "Scan WiFi" action icon to refresh locally available WiFi connections under LEAFOS Setting -> Network -> WiFi tab.
12. Reorganized Network settings with tabs for Ethernet, WiFi, DNS, Proxy, VPN, and Tests.
13. Added 'Ctrl+ALT+Esc' shortcut to access the LEAFOS Start Menu.
14. Added tool tips for setting menus that require explanations.
15. Updated vCAST Streaming software components for vSpace and RDS connections.
16. Updated UDS Enterprise Client to version 3.6.0.
17. Added various new WiFi drivers for x86-64 hardware device compatibilities.

The following LEAF OS issues have been fixed in version 4.11.2:

4. LEAF-902: Resolved occasional AVD session disconnection at dual displays or higher resolutions.
5. LEAF-1262: Fixed issue where AVD resource list was not displayed after MFA authentication.
6. LEAF-1328: Resolved incorrect routing table in LEAFOS when connecting and disconnecting IPsec/L2TP VPN.
7. LEAF-1317: Fixed VPN logon window staying visible when PMC sent a configuration with VPN disabled.

About previous 4.6.4 release

4.6.4 is an official maintenance update release which replaces the previous 4.5.1 and earlier versions with new features and important bug fixes.

Following are the new product features introduced in LEAF OS version 4.6.4:

1. Ability to change default microphone and speaker volume value by system extension.

Please refer to the ‘Additional notes’ section below for more detailed information about the configuration and use of the new product features.

The following LEAF OS issues have been fixed in version 4.6.4:

10. LEAF-1178 - DHCP-based PMC address auto-discovery doesn't work.
11. LEAF-1176 - AVD client (used in RDP mode) gets stuck when when the session host IP address was spelled incorrectly.
12. LEAF-1175 – Red and blue color components are swapped in vSpace sessions on 
13. LEAF-1171 - AVD client (used in RDP mode) with kiosk mode setting opens multiple error message windows when incorrect credential is entered, which can block or slow down the UI.
14. LEAF-1159 - AVD client (used in RDP mode) becomes unresponsive when wrong credentials are provided.
15. LEAF-1145 - When AVD client is used in RDP mode, the custom AVD client parameters provided do not get saved into the firmware setting and thus have no effect. 
16. LEAF-1165 - VPN connection is not restarting after device wakeup.
17. LEAF-1154 - vSpace session does not properly support dual-monitor with 1920x1080 in primary and 2560x1440 in secondary.
18. LEAF-1162 - Artifacts in vSpace session when resolution 2560x1440 is used with standard UXP protocol.

About Previous 4.5.1 release

Following are the new product features introduced in LEAF OS version 4.5.1:

11. Microsoft Teams optimization support in AVD (Azure Virtual Desktop), Windows365 and RDP sessions. Optimization includes:

1. Audio and Video Media Redirection. Audio and video streams in Teams are offloaded from the virtual desktop or remote desktop session and processed locally on the client device. This helps to reduce network bandwidth usage and to improve the overall user experience by minimizing latency and providing a smoother video conferencing experience.

2. Server-side configuration: refer to Microsoft document on “Use Microsoft Teams on AVD” 
3. Client-side configuration: 

2. For AVD and Windows 365 connection: By default, ‘Enable Microsoft Teams optimization’ is enabled.
3. For RDP connection: 

2. Make sure ‘RDP Client’ device operation mode is selected.
3. Then go to Setting > Connections and choose ‘AVD’ as ‘Client type’. 

2. Team optimization support for Give & Take Control, Live Captions, Transcriptions during conferencing call.

3. Team optimization support of video background effects (blurring and custom background) during video call (preview). Custom parameter is required to enable this ‘preview’ feature:

1. Client-side configuration: 

2. For AVD and Windows 365 connection: By default, ‘Enable Microsoft Teams optimization’ is enabled.
3. For RDP connection: 

2. Make sure ‘RDP Client’ device operation mode is selected.
3. Then go to Setting > Connections and selecte ‘AVD’ as ‘Client type’.

3. In Connections tab, under the ‘Custom parameters’ field, enter exactly the following parameter and click ‘Apply’:

teams background effects=b:true

12. Ability to select RDP client type.

The AVD client can now be used for on-prem RDP connections. Users can benefit from the features which are available in the AVD client (which is based on official Microsoft Linux client SDK), but absent in the standard RDP client:

2. Microsoft Teams optimization
3. RDP Shortpath

13. RDP Shortpath support (direct UDP-based transport between LEAF OS device and AVD session host). In AVD and RDP sessions within managed/private networks, RDP Shortpath greatly enhances overall user experience. (preview)

2. Server-side configuration & requirements: refer to Microsoft document “Configure RDP Shortpath for AVD”. 
3. To enable this feature on the client side, add the following AVD client custom parameter:

rdp shortpath=b:true

15. Cisco DUO MFA support for AVD authentication.
16. Ability to disable AVD client’s windowing options.

2. By default, AVD client full screen session can be windowed using Ctrl-Alt-Enter key combination, or mouse over the middle-top of the AVD desktop. 
3. To disable the windowing option (e.g. fully locked down and no multi-tasking), go to ‘Connections’ tab, under the ‘Custom parameters’ field, type in the following parameters (no space in between) and click ‘Apply’:

disable windowing options=b:false

16. Ability to automatically logoff the AVD user on last session exit.
    With the ‘Auto-logoff on last session exit’ option enabled, upon user logoff from the last AVD or Windows 365 RemoteApp or Remote Desktop session, LEAF OS will automatically exit the authenticated Azure account and return back to the AVD and Windows 365 logon page. 

1. Client-side configuration: Setting > Connections, enable ‘Auto-logoff on last session exit’.

17. Option to use NComputing’s Citrix user interface to display Citrix Virtual Apps and Desktops.

1. Client-side configuration:

1. In Citrix Workspace app mode, under Setting > Connections, disable the ‘Show Citrix SelfService user interface’ option. The Citrix user interface developed by NComputing will be used then.

18. User auto-logon support for Citrix Workspace App.
    Ideal for kiosk mode or single-task use case.

1. Client-side configuration: 

1. In Citrix Workspace app mode, under Setting > Kiosk Mode, enable ‘User auto-logon’ along with corresponding credentials. 

19. Option to hide 'Screen shadowing is active' message during device shadowing.

1. Client-side configuration: under Setting > Management > Screen shadowing, disable the ‘Display warning message during screen shadowing’ option.

Following are the enhancements in 4.5.1: 

22. Integrated latest Citrix Workspace App for Linux (version 2303); option to use older Citrix WSA (version 2209).
23. Integrated latest Microsoft AVD SDK.
24. GUI options to control the AVD client features:

3. H.264 support
4. Hardware acceleration for H.264 decoding
5. AAC audio codec

Note: In LEAF OS 4.2.8, these features were configurable with AVD custom parameters (please refer to LEAF OS 4.2.8 Release Notes below). If prior to 4.5.1 update you have been using the custom parameters to control the features, please remove them and use the new GUI options instead.

28. Updated local Zoom application to version 5.14.2.
29. Option to enable full caching for local Microsoft Teams application (e.g. display call history)
30. Client-side configuration: under Setting > Local Applications > Microsoft Teams, select ‘Enable full caching’.
31. Improved Citrix authentication error code handing.
32. Improved NTP time update speed.
33. Optimized Chromium caching for devices of different memory sizes.

The following LEAF OS issues have been fixed in version 4.5.1:

36. LEAF-1059 – OpenVPN client does not set the DNS servers pushed by the OpenVPN gateway
37. LEAF-1128 – In rare occasion, Ethernet/Wi-Fi IP (DHCP) renewal fails after lease expiration
38. LEAF-1097 - Hot-plug USB headset in LEAFOS firmware (outside VDI session) does not carry into VDI session
39. LEAF-1096 - Microphone not working in Windows 11 (RDP client)
40. LEAF-1093 - Local Zoom screen sharing doesn’t work
41. LEAF-1093 - AVD Teams Optimization - Screen flickering during multi-party call (fixed from beta release)
42. LEAF-1085 - Generate 'redirection settings' with none redirection fields when device receive no redirection policy from PMC
43. LEAF-1105 – Incorrect message is displayed when wrong credentials are provided in AVD session.

About previous 4.2.8 release

4.2.8 is a major official release which replaces the 4.1.206 (Tech Preview release), 3.9.0 (previous official release), and earlier versions with new features, enhancements, and bug fixes.

Following are the new product features introduced in LEAF OS version 4.2.8

44. Ability to choose between 2207 and 2209 Citrix Workspace app versions.
45. Ability to launch the Citrix sessions from Chromium web browser.
46. Support for FIDO2 redirection with Citrix Workspace app 2209.
47. Zoom Meetings optimization (audio/video offloading) for Citrix sessions.
48. Philips Speech optimizations for Citrix and RDP sessions (SpeechMike audio, Buttons, LEDs, DPM, and SpeechAir). 
49. Bluetooth peripherals support (beta preview for audio devices, keyboards and mice).
50. Secure Shell support with custom password.
51. Media Optimization support for Microsoft Teams in Azure Virtual Desktop (AVD) (private beta – contact NComputing).

Please refer to the ‘Additional notes’ section below for more detailed information about the configuration and use of the new product features.

Following are the enhancements in 4.2.8: 

21. NComputing LEAF OS Secure Boot support on x86-64 platforms, protecting the system against malicious code by ensuring only authenticated software runs on the device.
22. Included important update to latest Microsoft AVD SDK (version 2), with critical fix to support Kestrel which is required for the upcoming Azure infrastructure changes. All AVD and Windows 365 customers MUST migrate to this version (or newer) before May 31, 2023 to avoid potential AVD session interruptions.
23. Updated Citrix Workspace App to version 2209.
24. Updated FreeRDP client to version 2.7.
25. Updated software components for vCAST Streaming in vSpace Client.
26. Updated Zoom VDI optimization plug-in for Citrix to version 5.13.1 (22610).
27. Updated local Zoom Linux application to version 5.13.5.
28. HDMI hot-plug support.
29. Dual display alignment support (top/bottom for horizontal screen layout and left/right for vertical layout).
30. Redesigned Peripherals setting menu with Bluetooth configurable options.
31. Ability to pre-populate AVD username based on Kiosk Mode settings.
32. Support for the new PMC (3.1.0 or newer) firmware update command, letting the devices to use the update method and update source specified in Support section of device configuration.
33. Allow PMC remote ‘shutdown’ and ‘reboot’ request when terminal session is connected, or local app(s) is running.
34. Alt+F4 keyboard shortcut support to close the application in VDI session.
35. Consolidated display of unique WiFi SSID in mesh network environment.
36. Personal WiFi access credential caching support.
37. Additional Realteck and Broadcom WiFi drivers for new PC/laptop models support.
38. Improved NVMe SSD support for new PC/laptop models to install LEAFOS. 
39. Added touchpad double tab support. 
40. Support for Pipewire audio sub-system for enhanced audio performance.
41. AVD client-side hardware acceleration for smooth multimedia playback & rendering:

1. By default, the client-side hardware acceleration in AVD session is disabled. To enable client-side hardware acceleration:

2. Make sure ‘AVD Client’ device operation mode is selected.
3. Go to ‘Connections’ tab, under the ‘Custom parameters’ field, type in the following parameters (no space in between) and click ‘Apply’:

h.264 support=b:true;h.264 hwdraw=b:true;h.264 hwdecode=b:true

22. Support for Advanced Audio Coding (AAC) audio codec in AVD session for audio latency sensitive applications (e.g., VoIP, WebRTC, etc.):

1. By default, Pulse Code Modulation (PCM) audio codec is used in AVD session. To enable AAC audio codec in AVD session:

2. Make sure ‘AVD Client’ device operation mode is selected.
3. Go to ‘Connections’ tab, under the ‘Custom parameters’ field, type in the following parameters (no space in between) and click ‘Apply’:

audio codec=aaclc

23. AVD resource caching to improve user experience in case of network interruptions.

The following LEAF OS issues have been fixed in version 4.2.8:

31. LEAF-953 – Fixed VNC server not starting issue (for device shadow) when VNC password contains special characters.
32. LEAF-844 – Fixed client certificate import issue when the file name contains round brackets.
33. LEAF-823 – Fixed occasional VERDE disconnect issues after 5 minutes.
34. LEAF-869 – Fixed AVD display not extending to 2nd screen on Windows 7.
35. LEAF-881 - Fixed certain smartcards support issue in vSpace Client.
36. LEAF-966 – Fixed device does not refresh GUI issue after receiving ‘Firmware update’ settings pushed from PMC.
37. LEAF-988 – Fixed logoff from Local Application mode the active RDWeb/Citrix Web sessions are not terminated.
38. LEAF-995 – Fixed side-effect when CTRL+ALT+Arrow Up/Down key combination is pressed (to toggle local applications) while Citrix Workspace app is running in the foreground. 

About previous 3.9.0 release

3.9.0 is a major official release which replaces the 3.7.4 (Tech Preview release), 3.3.13 (previous official release), and earlier versions with new features, enhancements and bug fixes.

Following are the new product features introduced in LEAF OS version 3.9.0

45. Support of Citrix Workspace App (WSA) to connect to Citrix desktop virtualization environments

3. Citrix Workspace App (WSA) version 21.11 integration.
4. Citrix optimization includes Microsoft Teams optimization, Browser Content Redirection (BCR) support, native and generic USB redirection support for wide range of peripheral devices.
5. Citrix custom parameters support.

54. VDI session support via web portal with SPICE client (virt-viewer).
55. Ability to receive text messages from PMC Endpoint Manager (PMC 3.0 and above).
56. Support device “Raise Hand” feature to PMC Endpoint Manager (PMC 3.0 and above) for easier identification of devices whose users need help. When the device user presses the Shift-Ctrl-F2 key combination to ‘raise hand’ to PMC, PMC will display a notification and put a timestamp information into the “Raised Hand” column of Devices list.
57. Customized screen saver actions including sleep mode, screen blanking, static & hopping image display, and/or disconnecting local and VDI sessions; configurable option is under the device “Display” settings. 
58. Proxy server connection support to access desktop virtualization environments (Citrix, Microsoft AVD, Windows 365, RDS, vSpace Pro), PMC device management, local Chromium browsing and LEAF OS device activation.
59. Standalone RDP launcher support; enables starting RDP sessions as local applications. Please refer to the ‘Configure RDP client as local custom application’ knowledge base article for configuration details.
60. Custom Chromium policy support; Chromium policy customization file can be added under Local Applications > Chromium Browser. 
61. Please refer the ‘Customize local Chromium browser policy settings’ knowledge base article for configuration details. 
62. Multiple instances of local Chromium browser (e.g., different customized Chromium policies, pre-defined bookmarks, etc.) can be created on LEAF OS devices. Please refer to the ‘Configure multiple instances of local Chromium browser’ knowledge base article for instructions.

Following are the enhancements in 3.9.0: 

71. System taskbar UI enhancements.
72. Preservation of firmware update requests (from PMC) after device reboot.
73. Notify user when the device is shadowed by VNC.
74. New verbose logging option (under device Support > Troubleshooting).
75. Automatic user logoff after AVD session exit when only one AVD resource is published.
76. Clearing log files when size limits are exceeded.
77. Extended handling of the 'gatewayusagemethod' parameter from RDP files to allow bypassing the RD Gateway for local servers.
78. Lock down user local storage access to only /home/rx/Downloads from Chromium file explorer.
79. Updated Microsoft AVD SDK (5.25.2022).
80. Improved AVD autostart feature handling when resource is not found.
81. Enhanced AVD connection timeout handling and abiity to cancel AVD enumeration process.
82. Enhanced AVD session keep-alive handling during internet disruption.
83. Download Generic Files/Certificates from PMC before connecting VPN or changing network.
84. Autofocus for local administrator password prompt.
85. Improved RDP10 performance on EX500 thin clients.
86. Added support for RTL8192EU external WiFi adapter.
87. Updated vCAST Streaming component for vSpace and RDP connections.

The following LEAF OS issues have been fixed in version 3.9.0:

2. LEAF-820 - [vSpace Client] Pushing profile from vSpace Console or changing settings is not possible when session is connected.
3. LEAF-824 – In rare situation, VERDE RDP session disconnects after 5-minutes. 

90. LEAF-696 - Resolved AVD logon timeout issue after the device wakes up from the sleep mode or stays idle for an extended period of time.
91. LEAF-763 – Incorrect middle mouse button clicking functionality in AVD session.
92. LEAF-750 – Device setting menu is blocked after unsuccessful Azure authentication (AVD or Windows 365).
93. LEAF-695 – Inability to wake up the device after setting the screen saver timeout to 'Never' through VNC shadowing when the screen was already turned off.
94. LEAF-677 - Keys do not auto-repeat in VNC shadow.
95. LEAF-704 – After changing resolution, no cursor in firmware UI when entering login credential in kosk mode setting tab.
96. LEAF-715 – Disconnect FortiVPN  does not restore the default routing table.
97. LEAF-717 – "VPN Server Certificate" selected in FortiClient SSL VPN configuration in PMC does not get saved on the device.
98. LEAF-721 – Remote Firmware update progress should not be started when loca/custom application is running.
99. LEAF-722 – Collect device troubleshooting log should be possible during remote VNC shadowing from PMC.
100. LEAF-723 - Remote action shutdown/reboot should not be possible when Local/Custom app is running.
101. LEAF-731 – Resolved the issue where USB flash drive gets redirected to the VERDE guest session only when File Sharing is enabled from VERDE session settings.
102. LEAF-732 – Missing Ethernet or WiFi MAC address reported to PMC. 
103. LEAF-764 - GUI does not refresh historical 'RD Session Host' list combo-box when the configuration received from PMC contains the "main window"."custom rdp server history" array
104. LEAF-806 – Resolved black screen issue on the secondary display when certain dual display layout was configured.
105. LEAF-801 – Resolved launching multiple instances of Citrix Workspace app (observed in 3.7.4 Tech Preview release).
106. LEAF-787 – Resolved Citrix session disconnect issue when certain audio parameter was configured (observed in 3.7.4 Tech Preview release).
107. LEAF-798 – Resolved LEAF OS HDD installation error when live boot USB memory device size is larger than the target device HDD.
108. LEAF-726 – Resolved the GUI does not show up issue when the user logs off during vCAST web playback in vSpace session.