Created attachment 96893 [details]
dmesg > dmesg.txt

Dear all,

my second monitor, attached via HDMI-DVI-Adapter keeps turning on/off every
~20min. This is independant on what I am doing! The xorg-screen itself seems to
remain active (windows can be dragged from and to it). The first monitor
remains active.

All Standby-Options are turned off (Monitor set to switch off after one hour).

I can reactivate the monitor by switching to a text-console (ALT-F1) and back
(ALT-F7). nvidia-driver works fine (switched using the provided option of the
proprietary drives section of the Softwaremanager, no nvidia remained after
switching back to nouveau).

lspci | grep VGA
03:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 430]
(rev a1)

 lsb_release -rd
Description:    Ubuntu Trusty Tahr (development branch)
Release:    14.04