Comment # 9 on bug 64850 from Jakob Nixdorf

Ok, i tested a few things:

Turning the monitor off/on dosen't do anything, its still black.

Using xrandr to change the mode causes the first monitor to also turn black, I
will upload the output of "dmesg | grep drm" after the xrandr command,
Xorg.0.log doesn't say anything new.

The output of the xrandr command itself (with --verbose) is:

crtc 1: disable
screen 0: 2960x1050 780x277 mm  96.28dpi
crtc 1:    1280x1024   75.0 +1680+0 "DVI-0"