[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 #8 from Paulo Zanoni <przanoni at gmail.com> ---
Created attachment 84069
  --> https://bugs.freedesktop.org/attachment.cgi?id=84069&action=edit
Fix for the bug

Hi

Can you please verify this patch fixes the bug?

Please notice that this patch only fixes the "unclaimed register" messages.
When running module_reload I still see many problems which are not fixed by
this patch:
- We get a gpu hang most of the time
- Backlight doesn't work
- Sometimes we get an oops
- There's a big lockdep warning every time.

Thanks,
Paulo

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