[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 #50 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #49)
> Paulo has a new set of patches iirc ...

We recently merged the patches to fix the case where the power well is
_enabled_ while we do module_unload. I'm not sure how QA tests this bug, but
this case should be fixed.

What remains is the patch to enable the power well in case we unbind fbcon. I
have an implementation for this, but it touches the FB layer and it seems
people don't want to touch those files (even if we just add some callback
support). I need do re-check if there's a way to implement this without
touching anything outside drivers/gpu/drm/i915 (I already did it once, but can
try again...). If we do this, the code will work regardless of the loaded
console.

Chris recently submitted "drm/i915: Kick out vga console" which kills vgacon
and, as a consequence, also indirectly solves the problem.

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