[Bug 112159] Machine hang with i915.enable_psr=1 (Kaby Lake R)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112159

--- Comment #5 from Raphael Kubo da Costa <raphael.kubo.da.costa at intel.com> ---
I'm able to reproduce the issue with drm-tip at
5efc505498d2612451f6230a6347f4e0e1960e50 ("drm-tip: 2019y-10m-30d-22h-53m-25s
UTC integration manifest"), but getting a log is very hard: most of the time
this happens while I'm typing my LUKS password, or right after I finish typing
and press Enter. The screen flashes once very quickly and the whole machine
hangs, and it leaves no information in either /sys/class/drm/card0/error or
/sys/fs/pstore (the laptop doesn't have ECC and I'm trying to use EFI variables
for this).

There are a few occasions where instead of hanging the kernel outputs the
errors in the files I'll attach (2 dmesgs from 2 runs where this happened)
while allowing me to finish typing my password and booting.

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