AMD RX 5700 XT displays at 1024x768 in Debian Bullseye (Testing) despite having installed drivers and firmware.

linuxquestio · 02-05-2021, 05:21 PM

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
1024x768 76.00*

Emerson · 02-05-2021, 05:22 PM

This means your AMD driver failed to load and Xorg fell back to a generic driver. Look at your most recent Xorg log, check the timestamp to make sure you are not looking at some old one.

linuxquestio · 02-05-2021, 05:28 PM

I have four of them...

Xorg.0.log

Xorg.0.log.old

Xorg.1.log

Xorg.1.log.old

Emerson · 02-05-2021, 05:31 PM

Code:

ls -l

Probably Xorg.0.log is the latest, but check the timestamp.

linuxquestio · 02-05-2021, 05:34 PM

Emerson · 02-05-2021, 05:36 PM

Code:

23.109] (EE) open /dev/dri/card0: No such file or directory

This tell us the kernel driver is not loaded. Without it your AMD driver cannot work. Now you have to look at your dmesg to see why kernel driver is failing to load.

linuxquestio · 02-05-2021, 05:38 PM

Do I just type "dmesg" or should I supply some arguments?

linuxquestio · 02-05-2021, 05:39 PM

(Additionally, what am I looking for exactly?)

Emerson · 02-05-2021, 05:44 PM

I don't think you need sudo for that, maybe you do. You can redirect the output of a command into a file using '>'.

Code:

dmesg > myfreakindmesg

After this command you will have a file in your current directory named myfreakindmesg. These are Linux basics, dear linuxquestio ...

linuxquestio · 02-05-2021, 05:48 PM

bash: myfreakindmesg: Permission denied

linuxquestio · 02-05-2021, 05:50 PM

(Wait my bad, I had to be in a directory with write permissions. Here you go.)

Emerson · 02-05-2021, 06:00 PM

I see no trace of AMD DRI kernel driver loading. Looks like your kernel does not have it. This is Debian specific problem, I do not know how to get it in Debian. Maybe there is a deb package you need to install. I'd start reading Debian wiki. Maybe some Debian user will chime in, or you could open a new thread in Debian subforum.

linuxquestio · 02-05-2021, 06:12 PM

Is this just referring to the package for the Video Cards Drivers?

Emerson · 02-05-2021, 06:26 PM

I don't know how Debian categorizes it. It has been very long time since my last Debian. Basically, there is kernel DRI diver which creates direct access to the card, the node will be /dev/dri/card0 (card1 for second card, card2 for third). Once you have this node in /dev/dri you can start Xorg and then Xorg ATI driver will use this node to send the picture to your card and to the monitor(s) connected to it. The first driver is part of kernel, the second driver belongs to Xorg.

Debian wiki will have the answers, methinks.

linuxquestio · 02-05-2021, 07:29 PM

Okay, I couldn't find any kind of info on the Debian Wiki. However, after doing some searches and looking in my filesystem, I noticed I don't even have /dev/dri.

(I imagine this means something.)