Bug#919115: linux-image-4.19.0-0.bpo.1-amd64-unsigned: Graphical glitches (lightdm and cinnamon) after upgrading linux (RadeonRX540)
Some details on the lightdm/lockscreen issue.
I just noticed that if I switch to tty1 and go back to lightdm
everything is displayed properly, or well, that's what I thought at
first, because when I tried to click something or even type, it was
unresponsive, it's like a frozen frame, basically, like a lightdm's
screenshot. I could still notice the cursor responding to text areas,
so I could as well login successfully since lightdm is actually running.
From my deeply ignorant point of view, that 'black screen' at the
beginning it's more like the last 'frame' from the booting process,
after that, it never refreshes and appears to be pure blackness. If I go
tty mode, and go back to lightdm it refreshes graphically for a second,
but still, no animations at all, no text, no menus, nothing, like
clicking/typing on a picture, except for the cursor which seems to be
working correctly.
This is from journalctl, every time I go from lightdm/cinnamon's
lockscreen to tty and vice versa.
#tty1
14 00:10:31 debian kernel: [drm] PCIE GART of 256M enabled (table at
0x000000F400000000).
14 00:10:31 debian kernel: [drm] UVD and UVD ENC initialized successfully.
14 00:10:31 debian kernel: [drm] VCE initialized successfully.
14 00:10:38 debian kernel: amdgpu 0000:03:00.0: GPU pci config reset
#back to lockscreen (lightdm gives the same output)
14 00:11:03 debian kernel: [drm] PCIE GART of 256M enabled (table at
0x000000F400000000).
14 00:11:03 debian kernel: [drm] UVD and UVD ENC initialized successfully.
14 00:11:03 debian kernel: [drm] VCE initialized successfully.
14 00:11:10 debian kernel: amdgpu 0000:03:00.0: GPU pci config reset
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