[Nouveau] [Bug 31676] garbled text after loading nouveau module on EFI boot; X driver thinks there are no connected outputs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31676

--- Comment #7 from Ben Skeggs <skeggsb at gmail.com> 2010-11-25 04:29:13 PST ---
(In reply to comment #6)
> Hmm so based on the raw DCB:
> 
> [drm] nouveau 0000:02:00.0: Raw DCB entry 0: 040001b6 0f220010
> [drm] nouveau 0000:02:00.0: Raw DCB entry 1: 020112a6 0f220010
> [drm] nouveau 0000:02:00.0: Raw DCB entry 2: 02011262 00020010
> [drm] nouveau 0000:02:00.0: Raw DCB entry 3: 0000000e 0000000
> 
> It looks like the card is reporting 2 DP type outputs, and 1 TMDS output.  From
> the parsing of the connector table:
> 
> [drm] nouveau 0000:02:00.0:   0: 0x00002047: type 0x47 idx 0 tag 0x08
> [drm] nouveau 0000:02:00.0:   1: 0x00101146: type 0x46 idx 1 tag 0x07
> 
> It looks like the TMDS output is out of there... perhaps Apple just isn't using
> it.
They are using it, the TMDS encoder is linked to the type 0x46 connector and is
used when using a DP->DVI adaptor.

> The two left are an eDP connector and DP connector.  It seems Apple is now
> using eDP for internal display connections?  Interesting.
Yes, that's correct, as are most vendors now.

> 
> Then later:
> 
> [drm] nouveau 0000:02:00.0: expected bit 16 == 0, got 0x01114000
> No connectors reported connected with modes
> 
> Uh oh.  This appears to be from nouveau_dp_auxch(). Unfortunately I'm not sure
> I can puzzle out what all this is doing.  Presumably it's trying to query stuff
> on the eDP port/connector, but that's failing...?
It's failing for some reason yes, I'd need to look in more detail to figure out
why however.

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