ubuntu-x-swat team mailing list archive

[Damon Lynch <damonlynch@xxxxxxxxx>]

Additional comment from linux thinkpad mailing list participant Alex
Deucher:

"I think this may be a logic issue in gnome power manager (GPM) rather
than the driver.  If the following commands executed from a terminal
blank the displays properly:
sleep 5; xset dpms force off
then the driver is working correctly.  I have similar issues on fedora
on a w500 with AMD gaphics, so I suspect it's a GPM issue."

I can confirm running that command makes the external monitor sleep.

Given Alex is seeing the problem on a Thinkpad with a discrete AMD
display, he is probably correct -- this bug probably needs to be
assigned to another package, perhaps Gnome Power Manager.

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https://bugs.launchpad.net/bugs/711093

Title:
  [Natty,Maverick,Lucid] External monitor connected w/ Display Port
  power management not working when laptop LCD powered off