[Bug 89727] [SKL bisected] system hang when changing resolution in games or killing gnome-session twice

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89727

--- Comment #15 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to Matt Roper from comment #14)
> (In reply to Daniel Vetter from comment #12)
> > Can we just revert the skl part of this patch as an interim solution to
> > unblock QA? Matt, can you please prepare a patch.
> 
> Reverting the SKL part of my patch will just result in NULL-dereference and
> immediate crashes when killing X or doing anything else that causes the
> primary plane to be disabled, so I think that will be even more crippling
> than the current situation (at least today it sounds like you can bring X
> down and back up at least once before running into problems).

Hm right. Can we do a functional revert instead like in the other wm code, i.e.
assuming if state->fb == NULL that bpp == 4 and the primary plane spans the
full screen? Horrible hacks I know, but that should at least get us out of this
until someone can look at skl wm for real.

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