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[Bug 1538221] Re: Monitors on DisplayPort do not wake from sleep


Chris - I would totally love to do that, however apport gets stuck and
freezes during the collection process.  Is there any way I can get you
the information you need manually?

(I suspect the freeze is related to the issue I reported -- several
times, I've had freezes calling xrandr or other x- apps to try to get
information about the state of the monitors.)

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  Monitors on DisplayPort do not wake from sleep

Status in xorg package in Ubuntu:

Bug description:
  Potentially related:  

  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.

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