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Bug#919115: linux-image-4.19.0-0.bpo.1-amd64-unsigned: Graphical glitches (lightdm and cinnamon) after upgrading linux (RadeonRX540)



Today I tested this laptop with testing and unstable branch, all 
defaults, no personalized parameters or configurations.

About lightdm graphical glitches: Couldn't reproduce any hang, frozen 
frame, or 'black screen' when using testing or unstable branch. 
(firmware seems to be related, will test stretch with 
firmware-amd-graphics-20190114 when available), every animation is 
properly refreshed, from typing to menus.

About wallpaper issues: When using testing or unstable branch I couldn't 
reproduce any graphical glitches in wallpapers (neither cinnamon or 
lightdm) seems related to firmware as well.

About Cinnamon's lockscreen: Still buggy in both testing and unstable, 
although linux-image-4.19.0-3-amd64 is definitely smoother compared to 
4.19.0-2 (stretch,testing), cinnamon's lockscreen doesn't seem to 
refresh in real time, and it rather refreshes itself every 5 seconds 
exactly (easy to check with the lockscreen's clock). With stretch it 
doesn't refreshes at all so it looks like a black screen (like what 
happens with lightdm/stable), but it's actually running fine if you type 
the password (avoiding typos while typing blind), it's just that there's 
no graphical refreshing (to put in in my own terms lol).

Since amdgpu.dc it's enabled by default, an old issue with redshift not 
lowering the cursor's temperature color, it's as well fixed.

I do see some weird lines appearing and disappearing in the top right 
corner of my screen and some other areas, but I guess it's fine since 
it's unstable branch.


This laptop (acer with a12-9720p, radeon rx 540) works awful with linux 
btw, Acer doesn't care, neither AMD, sadly I might be returning it / 
selling it, next month.

Thanks for the help, sorry for any typos.


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