Try purging xserver-xorg-video-amdgpu and xserver-xorg-video-ati, then
restarting
X. That should automatically result in using the modesetting X driver. It does
for
my sea islands. If it's OK, either keep it that way, or try reinstalling only
xserver-xorg-video-amdgpu.
I tried to purge xserver-xorg-video-amdgpu and xserver-xorg-video-ati.
However it offered me to remove my entire desktop environment. So I
hesitated. I had a Pop!_OS installed on my drive which also encountered
the same graphical issues. So I instead installed a new Pop!_OS LTS on
my drive. The new Pop!_OS also froze when the command `DRI_PRIME=1
glxgears -fullscreen` is passed. This should indicate that the graphical
issue is not a result of my system tinkering. Since Pop!_OS is a
derivative of Ubuntu of which is a derivative of Debian, I think the
issue is either in Debian or upstream. I purged `firmware-amd-graphics`
but the graphical issue still persists. I cannot seem to locate which
package is causing the bug, so I am not sure how to file such an
ambiguous bug.
Bests Regards,
Guyenne
