[Bug 108264] [bisected] Console garbled on MacBookPro's

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108264

--- Comment #3 from Imre Deak <imre.deak at intel.com> ---
(In reply to Imre Deak from comment #2)
> Looks really like an FB corruption problem reported by Mika Westerberg. He
> bisected it to
> 
> commit 011f22eb545a35f972036bb6a245c95c2e7e15a0
> Author: Hans de Goede <j.w.r.degoede at gmail.com>
> Date:   Fri Apr 20 11:59:33 2018 +0200
> 
>     drm/i915: Do NOT skip the first 4k of stolen memory for pre-allocated
> buffers v2
> 
> Later Ville spotted in dmesg that it's caused by an incorrect assumption by
> the initial FB allocation code that an active FB during booting is always in
> stolen memory. In this case it's not and as a result the driver won't
> reserve the actual backing pages which will be later corrupted by whatever
> happens to allocate these pages.
> 
> Solution is to throw away the active FB in this case and allocate a new one.
> I'm planning to follow up with a patch for that.

ronald, oops, sorry didn't notice that you already bisected the same commit. So
this is definitely the same problem then.

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