I'm having a similar issue...I believe....my monitor goes blank after a certain time and doesn't turn back on....I looked up the error "drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting" and that brough me here....I've attached my dmesg output.....that output is *after* I turn the monitor back on from a dead state.
As far as I can tell no output is generated right before the blanking of the monitor. ** Attachment added: "dmesg.txt" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1189639/+attachment/3753950/+files/dmesg.txt -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1189639 Title: [dp] External Screen doesn't wake up from sleep Status in “xserver-xorg-video-intel” package in Ubuntu: Confirmed Bug description: I have a Lenovo X1 Carbon with an external screen connected to a Mini DP to VGA adapter. External screen works fine until the display goes to sleep for inactivity (just the display goes to sleep, not the laptop). When I return to the laptop, the built in screen wakes but the external screen does not. The screen is still detected, xrandr displays the resolution and I can move the cursor to the external display but the display remains off. I have tried cycling with Fn+F7 and also tried Ctrl+Alt+F1 then Ctrl+Alt+F7. The only way to get the external display back on is by disconnecting the adapter from the laptops DP port and reconnecting. dmesg produces: drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting Running Description: Ubuntu 13.04 Release: 13.04 kernel 3.8.0-23-generic xserver-xorg-video-intel: Installed: 2:2.21.6-0ubuntu4 As a workaround I have disabled the monitor from sleeping in System Settings->Brightness & Lock-> Turn Screen off when inactive for To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1189639/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
