I tested with 3.14, and same problem. But I caught some kernel messages every time I replug the screen:
[ 42.038474] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting [ 57.587925] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up [ 57.600327] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up [ 57.612303] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up [ 66.380412] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up [ 66.391831] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up [ 66.403830] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up I am not sure if it relevant, but it seems so. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1300914 Title: External screen undetected after first plug Status in “linux” package in Ubuntu: Confirmed Bug description: On Ubuntu 14.04, the external screen plugged on VGA is detected and get activated correctly. However, if I unplug it and then replug it later, it is not detected anymore and the screen receives no signal. A way to get it back to work is to reboot or simply suspend the computer. Sorry but I have no idea of what package is handling that. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1300914/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
