[Bug 80126] [HSW Regression]igt/kms_pipe_crc_basic causes "WARNING: CPU: 3 PID: 4309 at drivers/gpu/drm/i915/intel_pm.c:6174 check_power_well_state+0x69/0x6f [i915]()" sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80126

--- Comment #1 from liulei <lei.a.liu at intel.com> ---
resume from s3 cause this call trace too. 
reproduce steps:
xinit &
s3 and check dmesg.
--------------------------------------------------
-nightly: 891f8a6bb39ec9a0434c4f8ba468d203e89bf7cd (failed)
    drm-intel-nightly: 2014y-06m-24d-16h-16m-36s integration manifest
-queued: 9c33baa6b3bbb01c1a88dceba986b20e6642cf31 (failed)
    drivers/i915: Fix unnoticed failure of init_ring_common()
-fixes:  5b5ffff0d25060ab0e21fa0f6cd16428e87bf1ea (works)
    drm/i915: Hold the table lock whilst walking the file's idr and counting
the objects in debugfs

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