[Bug 100770] [BDW][EXT] igt at kms_fbcon_fbt@fbc-suspend cause the following kms_flip tests to fail on consecutive runs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100770

--- Comment #6 from Marta Löfstedt <marta.lofstedt at intel.com> ---
I have seen a similar sequence of issues going on with the pm_rpm tests.

i.e.
pm_runtime_get_sync() failed: -13
WARNING: CPU: 2 PID: 2308 at drivers/gpu/drm/i915/intel_drv.h:1755
intel_runtime_pm_get+0x9a/0xd0 [i915]
WARNING: CPU: 2 PID: 2308 at drivers/gpu/drm/i915/intel_drv.h:1755
gen6_read32+0x153/0x1d0 [i915]
WARNING: CPU: 3 PID: 208 at drivers/gpu/drm/i915/intel_display.c:8623
hsw_enable_pc8+0x6be/0x710 [i915]

and then the hsw_enable_pc8 WARN spams for a very long time after this
happended.

The issue is reproducible by spinning:
igt at pm_rpm@debugfs-read
igt at pm_rpm@i2c
igt at pm_rpm@pc8-residency
igt at pm_rpm@sysfs-read
igt at pm_rpm@system-suspend
igt at pm_rpm@system-suspend-execbuf
igt at pm_rpm@system-suspend-modeset
igt at pm_rpm@universal-planes

And it is also, not reproducible if I apply Imres patch.

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