[Nouveau] [Bug 29820] Nouveau doesn't handle VGA-OUT correctly on a 9400M (Macbook Unibody), but DVI-OUT works !?!?!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29820

--- Comment #2 from Ben Skeggs <skeggsb at gmail.com> 2010-08-26 15:28:48 PDT ---
This isn't an issue with VGA out, your macbook doesn't *do* VGA at all. 
DP->DVI works because the adaptor is passive, and the display looks basically
like normal DVI to the driver.  VGA on the other hand is an active adaptor, and
nouveau sees a DisplayPort monitor, not VGA.

Nouveau DP support is currently limited to working only when the VBIOS (or,
EFI) has initialised the display previously.  If it hasn't been, a blank screen
(or possibly badly synced screen sometimes) is the expected result.

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