[Bug 111701] New: PSR causes graphical glitches on Dell XPS 15 9570

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111701

            Bug ID: 111701
           Summary: PSR causes graphical glitches on Dell XPS 15 9570
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sultan at kerneltoast.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145375
  --> https://bugs.freedesktop.org/attachment.cgi?id=145375&action=edit
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.

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