You have been subscribed to a public bug:
Potentially related:
http://askubuntu.com/questions/546818/displayport-monitor-not-detected-if-switched-off-and-on-again
https://bugs.freedesktop.org/show_bug.cgi?id=88063
http://superuser.com/questions/945362/displayport-link-failure-after-monitor-sleep
I have three monitors plugged into an ATI HD 7950, one through DVI, the
others through DisplayPort, via dual-link adapters. When KDE puts the
monitors to sleep, only the DVI monitor wakes up, not the DisplayPort
monitors.
xrandr shows all three monitors on.
xset dpms force on does not work. Using xrandr to change the
resolution and change it back does not work. Logging out and logging
back in does not work. Trying to switch to CLI with shift-alt-f1, I see
a console, but it shows the bootlog (on the DVI monitor), without a
login prompt.
Trying to log out and log back in, lightdm behaves as though the other
two monitors are on, but only displays on the DVI.
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
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Monitors on DisplayPort do not wake from sleep
https://bugs.launchpad.net/bugs/1538221
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