[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #35 from Mahesh Kumar <mahesh1.kumar at intel.com> ---
Hi,

As issue seems something to do with memory with high load or coming out of
stand-by.
I would like to rule-out one more variable by disabling memory c-states.
which we can do by making WM latency 0 for level 1->7.

for making latency 0 please write following
#echo "2 0 0 0 0 0 0 0" > /sys/kernel/debug/dri/0/i915_pri_wm_latency

This will disable all the lower memory C-states except level-0,
rebooting system will restore default latency values.
If issue is due to lower memory c-states, above will make issue hard to
reproduce (or not reproducible).

If this is helping with issue, we may need to get help from HW team for getting
actual fix/WA for the issue.
If this is not helping we may need to start debugging in different direction.

Please attach complete dmesg logs for precious scenario comment#33 & #34 & this
scenario as well :)

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