[Nouveau] [Bug 41588] suspend/resume with active CRTC, but disconnected output causes problems

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41588

--- Comment #5 from Carsten Pfeiffer <pfeiffer at kde.org> 2012-09-10 19:56:32 UTC ---
I Lenovo notebook W510 with a GT216 [Quadro FX 880M] (rev a2) running
xserver-xorg-video-nouveau 1.0.1-3 (Debian unstable), Kernel 3.2.0-3-amd64.

My problem is that after resuming from ram, I cannot re-activate the LVDS-1
display if it had been disabled once before suspending.

To reproduce, do the following:
1. plug in external monitor (DVI here)
2. use xrandr or e.g. krandrtray to enable external display and disable
internal display (LVDS-1)
3. suspend to ram
4. resume
5. => LVDS-1 stays black forever, no way to reactivate it

I tried to disable the external display and re-enable LVDS-1 *before*
suspending, which works fine (LVDS-1 works). But after suspend&resume, LVDS-1
is black and cannot be reactivated.

A workaround is to keep LVDS-1 always on, but then you cannot use two external
displays anymore. For using two external displays, you *have* to disable
LVDS-1.

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