So xdiagnose doesn't work for me (I seem to hit bug #903484) but I added "drm.debug=0xe" to my kernel command line by hand, and got the following output.
This is not exactly the scenario described above -- I actually booted up at home away from my dock, suspended the laptop, came to work, and resumed in the dock. I had exactly the same situation that my external monitor wouldn't light up though, and I went through my (now-standard) workaround dance of: - log into text kernel and do xrandr --output LVDS1 --auto to turn on the laptop screen - light up the DP monitor at 1024x768 - switch the DP monitor to 2560x1440 at the same time as I turn off the laptop screen and I now have my X session working at native resolution on my external monitor. ** Attachment added: "drm-dmesg.txt" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/912387/+attachment/2660166/+files/drm-dmesg.txt -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/912387 Title: Intel graphics stack regression (oneiric->precise) with external displayport monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/912387/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
