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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][SHARDS] igt@* - incomplete - NMI backtrace for cpu \d skipped: idling at acpi_processor_ffh_cstate_enter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110331#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][SHARDS] igt@* - incomplete - NMI backtrace for cpu \d skipped: idling at acpi_processor_ffh_cstate_enter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110331">bug 110331</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>(In reply to Martin Peres from <a href="show_bug.cgi?id=110331#c3">comment #3</a>)
<span class="quote">> Let's monitor the failure rate now that the following commit has landed:
>
> <a href="https://cgit.freedesktop.org/drm/drm-intel/commit/?h=topic/core-for">https://cgit.freedesktop.org/drm/drm-intel/commit/?h=topic/core-for</a>-
> 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 <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI][BAT] igt@*pm_rpm@* - incomplete"
href="show_bug.cgi?id=108840">https://bugs.freedesktop.org/show_bug.cgi?id=108840</a>
> Root cause is believed to due to page fault in ACPI idle driver.
> (FDO <a href="show_bug.cgi?id=110331#c18">comment 18</a>).
> 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: <a href="mailto:martin.peres@intel.com">martin.peres@intel.com</a>
> Cc: <a href="mailto:daniel.vetter@intel.com">daniel.vetter@intel.com</a>
>
> Signed-off-by: Anshuman Gupta <<a href="mailto:anshuman.gupta@intel.com">anshuman.gupta@intel.com</a>>
> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
> Link:
> <a href="https://patchwork.freedesktop.org/patch/msgid/1554791361-27684-1-git-send">https://patchwork.freedesktop.org/patch/msgid/1554791361-27684-1-git-send</a>-
> <a href="mailto:email-anshuman.gupta@intel.com">email-anshuman.gupta@intel.com</a></span >
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.</pre>
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