I accidentally discovered a useful trick with my open-source #AMD #Radeon R9 270 GPU drivers on #Linux: when running the #Wayland GNOME session, if I encounter corrupt graphics (garbled on a black screen) while resuming from standby sleep, I can… simply press the power button to put the computer back to sleep, resume again, and it fixes itself!
No need to reboot or restart the display server!
I wonder how that's possible… & why it doesn't do that automatically.
@simplycorbett
Maybe it was merely coincidence from running older drivers when I was still on Xorg last year, but I don't remember being able to simply recover the GPU state by suspending & resuming when I was on Xorg (I also don't remember with great accuracy whether Xorg had garbled artifacts like that on resume occasionally, but I _think_ I had seen those before).
Attached image shows the use-after-free kfence error I saw in journalctl from the first resume tonight; absent in 2nd resume.
@simplycorbett In my casual experience over the years, AMD Mesa/Linux drivers are a bit temperamental, prone to lockups & crashes. Especially the infamous "ring stalled" errors!
Seems someone wrote an open letter about it in general: https://www.reddit.com/r/Amd/comments/1bsjm5a/letter_to_amd_ongoing_amd/
It once took me 2 years to discover that the Mesa drivers for AMD GPUs don't do any thermal throttling on Linux: they just crash, unlike the drivers on Windows (that would throttle the card's performance when overheating, and never crash).
Jeff Fortin T. (風の庭園のNekohayo)
SimplyCorbett
Bruce Elrick