[Bug 85890] [BDW]igt/tools_test + igt/drv_missed_irq_hang sporadically causes *ERROR* Unclaimed register detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85890

--- Comment #10 from Guo Jinxian <jinxianx.guo at intel.com> ---
I met similar error on BDW after resume from S4

root at x-bdwh01:/home/testframework# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[ 7633.842933] [drm:hsw_unclaimed_reg_detect.isra.7 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.
<3>[ 7633.853452] [drm:hsw_unclaimed_reg_detect.isra.7 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.

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