[Bug 111919] Intel card (Coffeelake) short freezes (hang) after upgrade to kernel 5.3.4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111919

--- Comment #7 from Stanislav Ochotnicky <freedesktop.org at ochotnicky.com> ---
Created attachment 145727
  --> https://bugs.freedesktop.org/attachment.cgi?id=145727&action=edit
/sys/class/drm/card0/error output with i915.dmc_firmware_path=/dev/null

I have managed to reproduce again - even after upgrading kernel to 5.3.5 and
adding i915.dmc_firmware_path=/dev/null kernel command line option.

Attaching new output of /sys/class/drm/card0/error

I haven't yet found an exact reproducer, but will try to dig. My current two
leads/ideas are:
 * Related to suspend/resume (i.e. I don't remember seeing hang after fresh
boot, only after suspend/resume cycle)
 * Related to IOMMU/2nd video card being assigned to a VM

Both of the above might be wild goose chases at this point though.

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