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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
