[Bug 110331] [CI][SHARDS] igt@* - incomplete - NMI backtrace for cpu \d skipped: idling at acpi_processor_ffh_cstate_enter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110331

--- Comment #6 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ville Syrjala from comment #5)
> (In reply to Martin Peres from comment #3)
> > Let's monitor the failure rate now that the following commit has landed:
> > 
> > https://cgit.freedesktop.org/drm/drm-intel/commit/?h=topic/core-for-
> > CI&id=b573fba52f339dc4fadef7282af4a9413fd6173d
> > 
> > CL HACK: Disable ACPI idle drivertopic/core-for-CI
> > There were few system hung observed while running i915_pm_rpm igt test.
> > FDO https://bugs.freedesktop.org/show_bug.cgi?id=108840
> > Root cause is believed to due to page fault in ACPI idle driver.
> > (FDO comment 18).
> > It has been suggested by Daniel Vetter to disable ACPI idle
> > driver for Core-for-CI, only for ICL.
> > 
> > This hacky patch is only for ICL processor and for Core-for-CI branch.
> > 
> > v2: Fixed compilation errors raised by lkp.
> >     commit message improvement.
> > 
> > Cc: martin.peres at intel.com
> > Cc: daniel.vetter at intel.com
> > 
> > Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Link:
> > https://patchwork.freedesktop.org/patch/msgid/1554791361-27684-1-git-send-
> > email-anshuman.gupta at intel.com
> 
> Ugh. I think this means we've effectively disabled all C-states in CI. Last
> I looked intel_idle icl support wasn't upstream yet.

Yeah, no C-states visible on icl-u2. So low power watermarks and whatnot not
getting tested at all currently.

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