Re: [PATCH v3] drm/i915: Add missing MacBook Pro models with dual channel LVDS

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Hi Ville,

> I would suggest splitting that into a separate patch. Otherwise it's
> going to harder to revert either change separately, should the need
> arise. So that part is
> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Okay, commit split in two as requested.

Question:

Daniel Vetter hardcoded the MacBookPro8,2 with commit
618563e3945b9d0864154bab3c607865b557cecc, noting:
"Add a dual link lvds quirk for MacBook Pro 8,2
When booting with EFI, Apple botched this one up."

Nouveau recognizes just fine that dual channel LVDS is necessary,
it seems to retrieve this information from VBIOS.

On the other hand, when i915 initializes, it logs the following
complaint (on a MacBookPro9,1): "[drm] failed to find VBIOS tables".

Would it be possible to somehow point i915 to the correct location
where it can find the VBIOS? Or can we somehow copy the VBIOS nouveau
is using? I'm wondering, even if we had to hardcode memory locations
to do that, wouldn't that make more sense rather than hardcoding the
DMI IDs?

Thanks,

Lukas
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