*** This bug is a duplicate of bug 1308105 ***
https://bugs.launchpad.net/bugs/1308105
This affects me too. I have a GTX 660 connected to a HP LP2475w monitor
with Ubuntu Desktop 14.04 over a DisplayPort cable. Switch the monitor
off and on again, and it says no signal. I have to reboot to get the
machine back. This makes DisplayPort unusable. The problem goes away
with a DVI cable. See my question here:
http://askubuntu.com/questions/546818/displayport-monitor-not-detected-
if-switched-off-and-on-again
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https://bugs.launchpad.net/bugs/1313539
Title:
monitor shows black screen and "no input signal" after turning the
monitor off and on manually
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