[SOLVED] startx Error maybe lightdm Error

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DevNode101

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Dec 20, 2022
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Followed https://pve.proxmox.com/wiki/Developer_Workstations_with_Proxmox_VE_and_X11 when I rebooted lightdm and startx aren't working.

lightdm is saying something like Failed to use bus name org.freedesktop.displaymanager do you have permission? or something like that

startx has this error in the Xorg.log

[ 644.818] (II) modesetting: Driver for Modesetting Kernel Drivers: kms [ 644.818] (II) FBDEV: driver for framebuffer: fbdev [ 644.818] (II) VESA: driver for VESA chipsets: vesa [ 644.818] (EE) open /dev/dri/card0: No such file or directory [ 644.818] (WW) Falling back to old probe method for modesetting [ 644.818] (EE) open /dev/dri/card0: No such file or directory [ 644.818] (II) Loading sub module "fbdevhw" [ 644.818] (II) LoadModule: "fbdevhw" [ 644.818] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 644.818] (II) Module fbdevhw: vendor="X.Org Foundation" [ 644.818] compiled for 1.20.11, module version = 0.0.2 [ 644.818] ABI class: X.Org Video Driver, version 24.1 [ 644.818] (EE) Unable to find a valid framebuffer device [ 644.818] (WW) Falling back to old probe method for fbdev [ 644.818] (II) Loading sub module "fbdevhw" [ 644.818] (II) LoadModule: "fbdevhw" [ 644.818] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 644.818] (II) Module fbdevhw: vendor="X.Org Foundation" [ 644.818] compiled for 1.20.11, module version = 0.0.2 [ 644.818] ABI class: X.Org Video Driver, version 24.1 [ 644.818] (II) FBDEV(2): using default device [ 644.818] (EE) Screen 0 deleted because of no matching config section. [ 644.818] (II) UnloadModule: "modesetting" [ 644.818] (EE) Screen 0 deleted because of no matching config section. [ 644.818] (II) UnloadModule: "fbdev" [ 644.818] (II) UnloadSubModule: "fbdevhw" [ 644.818] (EE) Fatal server error: [ 644.818] (EE) Cannot run in framebuffer mode. Please specify busIDs for all framebuffer devices

Using: proxmox-ve_7.3-1

Help? I can't find any solution, I'm on hour 10 for this specific issue...
Somewhat new to linux so please be explicit, please and thanks.
 
Sounds like you are most likely missing GPU drivers for your hardware.
Did you install them correctly? There's an official Debian page describing the process for each vendor you can follow.

Could you then also provide the output of lspci -nnk | grep -A3 VGA?
 
lspci -nnk | grep -A3 VGA
5a:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:164e] (rev c1) Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:164e] 5a:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:1640] Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:1640]

The amdgpu drivers are already installed.

Its using the integrated graphics for a ryzen X7950
 
From the output of lspci it looks like the amdgpu kernel module isn't loaded. Did you reboot after installing them?

Also, are there any logs/errors in dmesg regarding amdgpu (dmesg | grep amdgpu)?
 
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