It's with a Samsung Q35 with VGA Output. Before I used Gentoo and I didn't have 
any problems connecting the external monitor.
In the beginning it works, just after a while it starts flashing every few 
minutes until finally the monitor becomes black. I can still switch to TTY1 to 
reboot the system (restarting gdm doesn't help, afterwards the monitor still 
stays black). 
I'm using the external monitor only, switching of the laptop monitor.

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X video rendering intermittently fails if DRI or composite is enabled
https://bugs.launchpad.net/bugs/226272
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