[Bug 103179] [CI][SHARDS] igt at perf@rc6-disable - fail - Failed assertion: n_events_end - n_events_start != 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103179

--- Comment #15 from umesh <umesh.nerlige.ramappa at intel.com> ---
rc6 residency is a value read from sysfs that increments when system is allowed
to enter/exit rc6 states. i915 perf open gets the runtime pm so that rc6 is
disabled as long as perf use case is running. perf close puts/releases the
runtime pm.  The tests measures the rc6 residency around a sleep of 500 ms
after calling perf_open and expects the rc6 residency value to stay the same.
Later it measures the rc6 residency after calling perf close. the test expects
the value to change/increment aroung the sleep. This failure is for the latter
rc6 measurement when the values did not increment.

One possible reason is explained in the fix here -
https://patchwork.freedesktop.org/patch/299891/?series=59582&rev=2

Machines: skl, kbl
Repro rate: 12%

Impact: Delay/Failure in rc6 residency may affect power metrics, however the
prior analysis points to updating the test code to synchronize with the
completion of delayed work that i915 is doing. This makes Severity -
Low/Medium. Priority stays High.

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