[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 #14 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #13)
> Paulo, I add drm.debug=0xe to grub, the attached dmesg is full dmesg. 
> 
> > 
> > - Boot the machine
> > - SSH to it from another machine
> > - Run ./module_reload from the SSH session
> > - dmesg > dmesg.txt
> > 
> > Does that work for you?
> 
> Because system hang, I use netconsole.
> 
> Do you have any suggest for more dmesg?

I really can't reproduce your bug. Can you please attach the full "dmesg" from
right before you run module_reload? Please do it with drm.debug=0xe. Also
please attach the output of "lsmod" from right before when you run
module_reload.

Also, please check if when you run module_reload you get some error messages
about module i915 still being loaded.

Also, please check whether you're just getting a backlight bug or a real full
machine hang.

I'm running drm-intel-nightly.

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