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

[bugzilla-daemon at freedesktop.org]

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

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imre.deak at intel.com,
                   |                            |ville.syrjala at linux.intel.c
                   |                            |om

--- Comment #2 from Imre Deak <imre.deak at intel.com> ---
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.

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