[Bug 67813] [HSW bisected]igt/module_reload causes [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44004 and system hang with headless, with power well disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67813

--- Comment #24 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #23)
> (In reply to comment #22)
> > That "i915.ko still loaded!" message really suggests there are programs you
> > need to kill before doing the tests. Please make sure your testing
> > environment is correct before you try to run module_reload.
>   Since Kernel 3.12.0rc2, after running "echo 0 >
> /sys/class/vtconsole/vtcon1/bind" and "rmmod intel_ips &> /dev/null", lsmod
> shows there are still 2 programs using i915 module on haswell(I check all
> platform, this only happens on haswell). It causes i915 module can not be
> unloaded. I don't know what are the 2 programs, and how to kill them. 

Could be the audio driver holding module references for the power well stuff.
Can you please unload all sound drivers and see whether that gets rid of the
references?

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