[Nouveau] [Bug 92274] New: nouveau black screen and errors with two monitors attached

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92274

            Bug ID: 92274
           Summary: nouveau black screen and errors with two monitors
                    attached
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: joseph-thommes at gmx.de
        QA Contact: xorg-team at lists.x.org

Hello,
I switched from the proprietary nvidia-drivers to nouveau under Gentoo.
I use a Dual-Monitor Setup: one is connected to the DVI-I and the other one to
the HDMI output of my Nvidia GTX 770.
Under my Manjaro installation I use the proprietary driver and everything
works;
under Gentoo everything was fine with the nvidia-drivers, too.
Now I can boot without errors into Gentoo when only one of the monitors is
connected, no matter which one.
However, when both monitors are attached to the graphics card,
I cannot access a tty or my graphical login manger:
the screens turn off showing "no input signal".
Me not being able to access my Gentoo installation by booting into it when the
error happens,
I chrooted into it and used cat /var/log/dmesg.
I know that this is not what the nouveau reporting guide suggests for obtaining
a kernel log,
but if I run dmesg from my chrooted environment I obviously get the kernel log
of my Manjaro boot.
If there is another better way for obtaining the kernel log, please let me
know.

VBIOS is following in a few minutes.

If there is anything else missing, let me know.

lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 770]
(rev a1)

kernel version: x86-64 4.0.5-linux-gentoo
nouveau version: x11-drivers/xf86-video-nouveau-1.0.11
libdrm version: x11-libs/libdrm-2.4.59
mesa version: media-libs/mesa-10.3.7-r1
X server: x11-base/xorg-server-1.16.4

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