[Nouveau] [Bug 90626] HP ZBook 15 nouveau driver hangup for kernel >= 4.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90626

--- Comment #24 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looks like this bios hard-codes a 4K return size for each bios chunk fetch.
There is a "fast" and a "slow" method in nouveau... the fast one grabs it all
in one go, while the "slow" one does it 4K at a time.

In drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadow.c, try commenting out the
line

                { 0, &nvbios_acpi_fast },

For some reason we're not detecting that it's fetching a bad bios...

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