[Nouveau] [Bug 38074] Dual head doesn't work for some combination of monitors (second screen still off)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38074

--- Comment #9 from Ben Skeggs <skeggsb at gmail.com> 2011-07-28 15:56:01 PDT ---
(In reply to comment #5)
> 
> That means ... DVI-I-1 always works, DVI-I-2 never works

Okay.  That's interesting to know.  There's nothing too immediately obvious as
to why that'd be the case so far..


(In reply to comment #7)
> I'm just guessing... it seems that the driver was tuned/developed for
> variations of cards, which had 1xDVI and 1xDSUB connector and thus two DVI
> outputs were not expected.

No, that's definitely supposed to work.  This problem is a board-specific
problem, and not a general issue with nouveau.

Okay.  Can you get me 2 logs.  Firstly, can you plug a single display into the
working port and boot with "log_buf_len=1M drm.debug=15 nouveau.reg_debug=0x400
3", and save the dmesg output.  Then, can you plug a single display into the
non-working port and ssh (or blindly login) and grab the dmesg output from that
also.

Can you also attach your vbios image, which can be retrieved by:

mount -t debugfs debugfs /sys/kernel/debug

And the vbios (if nouveau is loaded) will be accessible at
/sys/kernel/debug/dri/0/vbios.rom.

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