[Nouveau] [Bug 76475] [NVE7] fails to load due to unknown opcode 0x80 (incorrect vbios)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76475

--- Comment #10 from Ilia Mirkin <imirkin at alum.mit.edu> ---
My (limited) understanding is that _DSM is used to turn the card on/off and
switch the mux on relevant laptops between the different GPU's. And the ACPI
vbios method was introduced for optimus laptops -- those checks have always
been there. I'm fairly sure they can be dropped.

Just to confirm -- dropping the checks from
nouveau_acpi.c:nouveau_acpi_rom_supported (and no other changes) makes the
VBIOS get loaded from ACPI, without errors.

For the kworker thing -- see what's going on -- 'echo w > /proc/sysrq-trigger'
(iirc; perhaps a different sysrq would be helpful... see if it's in nouveau or
not. even if it is, it may not be related to this specific issue.)

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