Bug#919115: linux-image-4.19.0-0.bpo.1-amd64-unsigned: Graphical glitches (lightdm and cinnamon) after upgrading linux (RadeonRX540)
Just upgraded to firmware-amd-graphics-20190114/stretch-backports and
nothing changed, therefore lightdm might be working with testing branch
because of lightdm's version or something unrelated to linux itself
(maybe mesa?), still, it used to work correctly with stretch until linux
4.18.20 (at least the lightdm thing because I had hdmi issues). After
4.19 I've been having to rely on 'amdgpu.dc=0' to avoid graphical
glitches, but amdgpu.dc=1 to get audio through HDMI.
Wallpaper glitches are gone, but cinnamon's lockscreen is still bugged,
stuck and freezed just like lightdm's 'black screen' (if switching from
tty to lightdm/lockscreen it refreshes once but it doesn't refreshes in
real time so you can't see any typing or menus/dialogs working, although
they're working, just not graphically) 'amdgpu.dc=0' still a workaround
fortunately. Worth remembering that with debian unstable it refreshes
every 5 seconds (only lockscreen, lightdm just works like I said).
I have these graphical glitches only with debian.
Ever since kernel 4.16 I have lot of weird things going on with amdgpu
(Acer laptop with AMD A12-9720P RADEON R7 RADEON RX540) (all distros).
Fortunately debian it's still the most reliable distro IME.
If anyone it's interested in improving support for this laptop, there
are a few important bugs in bugzilla.kernel, and bugs.freedesktop
regarding AMD A12-9720P RADEON R7 RADEON RX540. A lot of work it's
needed to get this laptop working with debian, since this laptop won't
even boot properly with kernel 4.9 from stable.
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