PSR causes graphical glitches on Dell XPS 15 9570
Submitted by Sultan Alsawaf
Assigned to José Roberto de Souza
Created attachment 145375
9570 EDID info
Since PSR was enabled in i915 somewhere around Linux 5.0, my Dell XPS 15 9570 (i7-8750H) experiences very frequent graphical glitches (FIFO underruns), even on drm-tip. I can easily reproduce the glitches 100% of the time, since there is always a glitch when gnome shell starts. The dp_retry_max_vs_optim branch from https://github.com/vsyrjala/linux.git doesn't fix the issue. However, the glitches are completely fixed by passing i915.enable_psr=0 on the kernel command line. I've attached my EDID info.
Attachment 145375, "9570 EDID info":