[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

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Whiteboard|Triaged                     |Triaged, ReadyForDev
           Severity|normal                      |major
                 CC|                            |chris at chris-wilson.co.uk
           Priority|medium                      |high
             Status|NEEDINFO                    |NEW

--- Comment #10 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Chris Wilson from comment #5)
> Disabling dmc will prevent reaching package c-state 8+, otherwise it should
> be no impact, so we are on the lookout to see if it hangs again.

(In reply to Stanislav Ochotnicky from comment #7)
> Created attachment 145727 [details]
> /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.

CC'ing Chris.

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