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drm/nouveau/acpi: allow non-optimus setups to load vbios from acpi
There appear to be a crop of new hardware where the vbios is not available from PROM/PRAMIN, but there is a valid _ROM method in ACPI. The data read from PCIROM almost invariably contains invalid instructions (still has the x86 opcodes), which makes this a low-risk way to try to obtain a valid vbios image. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76475Signed-off-by: NIlia Mirkin <imirkin@alum.mit.edu> Cc: <stable@vger.kernel.org> # v2.6.35+ Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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