[Nouveau] [Bug 67382] [nouveau, nv50] linux 3.9.7-3.10.3: Xorg won't be available

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67382

--- Comment #3 from Emil Velikov <emil.l.velikov at gmail.com> ---
(In reply to comment #0)
> After looking at #66129 and testing linux 3.10.3 (includes the patches from
> 66129) and still having problems, I decided to open a bugreport, as the
> problem appears to be something else.
> I'm not sure if the topic describes the problem really well.
> 
> 
> First I should mention, that I wrote a bugreport on the kernel tracker:
> https://bugzilla.kernel.org/show_bug.cgi?id=60071
> Which was probably the wrong place, and a complete different description.
> 
> 
> Machine:
> One from the nv50 (8800 GTS) graphic cards. One monitor.
> 
So in case of 3.9.7 your system seems to be detecting a ghost monitor, hooked
up to your DVI-I-2. Did I get that right?

> Notes:
> *early KMS
> 
> 
> Issue:
> With 3.9.6 everything is working fine. Systems boots and I'm getting my DM
> 
> 3.9.7 introduced following changes:
> commit aed4802d2a0d2f6c7179a2c03e184860741788c0
> Author: Ben Skeggs <bskeggs at redhat.com>
> Date: Mon Jun 3 16:40:14 2013 +1000
> 
> drm/nv50/kms: use dac loadval from vbios, where it's available
> 
> commit d40ee48acde16894fb3b241d7e896d5fa84e0f10 upstream.
> -------
> commit b242745947ed7562ad91dad9e9fde1a92e40d666
> Author: Ben Skeggs <bskeggs at redhat.com>
> Date: Mon Jun 3 16:07:06 2013 +1000
> 
> drm/nv50/disp: force dac power state during load detect
> 
> commit ea9197cc323839ef3d5280c0453b2c622caa6bc7 upstream.
I would suspect this ^^ commit to be the one causing the issue. Can you please
revert it on top of 3.9.7 and confirm ?
How many monitors does that kernel detect ?

> -------
> 
> Since 3.9.7 (also tested with 3.9.8 and 3.10.3) the X-server won't be
> accessible. If that's the right description. I'm just seeing a black screen
> and I just can switch back to a tty (which takes it time).
> Tried it with a DM and without (plain xinit/startx from tty).
> 
A brief explanation what happens here:
Nouveau detects a phantom/ghost monitor hooked up to DVI-I-2, which on it's own
causes the DISPLAY engine to hang. Leading to the kernel being unable to change
the resolution(modesetting), and X failing to start and VT switch being dead
slow

Cheers
Emil

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