(EE) Failed to create gbm

[ajw685]

OS: Debian 12 (Bookworm) / Ubuntu 22.04 (Jammy)
System: HP T520 Thin Client; AMD GX-212JC (dual core)
GPU: Radeon R2E
Remote Viewing Browser: Chrome (Windows)

I'm trying to start kasmvnc with -hw3d flag and every time I get the following:

guy@computer:/tmp$ vncserver -hw3d
Could not start Xvnc.

 2024-06-29 00:38:15,735 [DEBUG] Config: set QueryConnect(Bool) to 0(0)
 2024-06-29 00:38:15,736 [DEBUG] Config: set VideoOutTime(Int) to 3
 2024-06-29 00:38:15,736 [DEBUG] Config: set key(String) to /etc/ssl/private/ssl-cert-snakeoil.key
 2024-06-29 00:38:15,736 [DEBUG] Config: set interface(String) to 0.0.0.0
 2024-06-29 00:38:15,736 [DEBUG] Config: set AllowOverride(String) to AcceptPointerEvents,SendCutText,AcceptCutText,SendPrimary
 2024-06-29 00:38:15,736 [DEBUG] Config: set CompareFB(Int) to 2
 2024-06-29 00:38:15,736 [DEBUG] Config: set DLP_KeyRateLimit(Int) to 0
 2024-06-29 00:38:15,736 [DEBUG] Config: set cert(String) to /etc/ssl/certs/ssl-cert-snakeoil.pem
 2024-06-29 00:38:15,736 [DEBUG] Config: set BlacklistTimeout(Int) to 10
 2024-06-29 00:38:15,736 [DEBUG] Config: set JpegVideoQuality(Int) to -1
 2024-06-29 00:38:15,736 [DEBUG] Config: set PrintVideoArea(Bool) to 0(0)
 2024-06-29 00:38:15,736 [DEBUG] Config: set MaxConnectionTime(Int) to 0
 2024-06-29 00:38:15,736 [DEBUG] Config: set UseIPv6(Bool) to 1(1)
 2024-06-29 00:38:15,736 [DEBUG] Config: set KasmPasswordFile(String) to /home/guy/.kasmpasswd
 2024-06-29 00:38:15,736 [DEBUG] Config: set BlacklistThreshold(Int) to 5
 2024-06-29 00:38:15,737 [DEBUG] Config: set DLP_RegionAllowRelease(Bool) to 0(0)
 2024-06-29 00:38:15,737 [DEBUG] Config: set FrameRate(Int) to 60
 2024-06-29 00:38:15,737 [DEBUG] Config: set ImprovedHextile(Bool) to 1(1)
 2024-06-29 00:38:15,737 [DEBUG] Config: set DLP_ClipAcceptMax(Int) to 0
 2024-06-29 00:38:15,737 [DEBUG] Config: set MaxDisconnectionTime(Int) to 0
 2024-06-29 00:38:15,737 [DEBUG] Config: set AcceptCutText(Bool) to 1(1)
 2024-06-29 00:38:15,737 [DEBUG] Config: set SendPrimary(Bool) to 0(0)
 2024-06-29 00:38:15,737 [DEBUG] Config: set httpd(String) to /usr/share/kasmvnc/www
 2024-06-29 00:38:15,737 [DEBUG] Config: set DynamicQualityMin(Int) to 7
 2024-06-29 00:38:15,737 [DEBUG] Config: set IdleTimeout(Int) to 0
 2024-06-29 00:38:15,737 [DEBUG] Config: set UseIPv4(Bool) to 1(1)
 2024-06-29 00:38:15,737 [DEBUG] Config: set VideoScaling(Int) to 2
 2024-06-29 00:38:15,737 [DEBUG] Config: set AvoidShiftNumLock(Bool) to 0(0)
 2024-06-29 00:38:15,737 [DEBUG] Config: set DLP_Log(String) to off
 2024-06-29 00:38:15,737 [DEBUG] Config: set DLP_ClipSendMax(Int) to 0
 2024-06-29 00:38:15,737 [DEBUG] Config: set websocketPort(Int) to 8444
 2024-06-29 00:38:15,737 [DEBUG] Config: set DisconnectClients(Bool) to 0(0)
 2024-06-29 00:38:15,737 [DEBUG] Config: set MaxVideoResolution(String) to 1920x1080
 2024-06-29 00:38:15,737 [DEBUG] Config: set DynamicQualityMax(Int) to 8
 2024-06-29 00:38:15,737 [DEBUG] Config: set WebpVideoQuality(Int) to -1
 2024-06-29 00:38:15,737 [DEBUG] Config: set udpFullFrameFrequency(Int) to 0
 2024-06-29 00:38:15,738 [DEBUG] Config: set AcceptSetDesktopSize(Bool) to 1(1)
 2024-06-29 00:38:15,738 [DEBUG] Config: set SendCutText(Bool) to 1(1)
 2024-06-29 00:38:15,738 [DEBUG] Config: set QueryConnectTimeout(Int) to 10
 2024-06-29 00:38:15,738 [DEBUG] Config: set RectThreads(Int) to 0
 2024-06-29 00:38:15,738 [DEBUG] Config: set DLP_ClipTypes(String) to chromium/x-web-custom-data,text/html,image/png
 2024-06-29 00:38:15,738 [DEBUG] Config: set DLP_ClipDelay(Int) to 0
 2024-06-29 00:38:15,738 [DEBUG] Config: set RawKeyboard(Bool) to 0(0)
 2024-06-29 00:38:15,738 [DEBUG] Config: set AcceptPointerEvents(Bool) to 1(1)
 2024-06-29 00:38:15,738 [DEBUG] Config: set VideoTime(Int) to 5
 2024-06-29 00:38:15,738 [DEBUG] Config: set sslOnly(Bool) to 1(1)
 2024-06-29 00:38:15,738 [DEBUG] Config: set DLP_RegionAllowClick(Bool) to 0(0)
 2024-06-29 00:38:15,738 [DEBUG] Config: set IgnoreClientSettingsKasm(Bool) to 0(0)
 2024-06-29 00:38:15,738 [DEBUG] Config: set VideoArea(Int) to 45
 2024-06-29 00:38:15,738 [DEBUG] Config: set desktop(String) to computer:1 (guy)
 2024-06-29 00:38:15,738 [DEBUG] Config: set MaxIdleTime(Int) to 0
 2024-06-29 00:38:15,738 [DEBUG] Config: set TreatLossless(Int) to 10
 2024-06-29 00:38:15,738 [DEBUG] Config: set ClientWaitTimeMillis(Int) to 30000
 2024-06-29 00:38:15,738 [DEBUG] Config: set PasswordFile(String) to /home/guy/.vnc/passwd
 2024-06-29 00:38:15,738 [DEBUG] Config: set rfbport(Int) to 5901
_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root

Xvnc KasmVNC 1.3.1.230e50f7b89663316c70de7b0e3db6f6b9340489 - built Mar 15 2024 09:25:50
Copyright (C) 1999-2018 KasmVNC Team and many others (see README.me)
See http://kasmweb.com for information on KasmVNC.
Underlying X server release 12008000, The X.Org Foundation

(EE)
Fatal server error:
(EE) Failed to create gbm
(EE)
```
`
Does the same thing on Ubuntu (gnome) and Debian (xfce). Yes, using the different packages for each OS.
I logged in using keyboard/mouse/montior and ran diagnostics, mesa-utils/glxgears which outputs right at 60 fps and stable, and lshw shows radeon driver is in use

kasmvnc will run without GPU /without -hw3d flag

I'm not sure where to start looking to solve this problem.
I had kasmvnc installed on this machine last year (~august '23) with Debian 12 and was able to use hw3d successfully, but can't remember the shenanigans I needed to do to make it work, if any.

[ajw685]

if you run kasmvnc with root: sudo vncserver -hw3d

the server will start and you can connect to it through a browser, but

you get a black screen with this dialog box; once you click close it disappears and is just a black screen

installing dbus x11 package allows for hardware acceleration access to kasmvnc, just the problem is you have to run it sudo/root

[clbr]

This sounds like you lack permissions to the device node (/dev/dri/renderD128). Your user should be added to the group that owns that file, or you could change its permissions to allow rw for your user.

[ajw685]

Thank you! I'll investigate and report back.