Just wanted to add that I am experiencing a similar issue with the 2415 not waking after suspend. I don't seem to be having the some problems with screen resolution, monitor detection, or weirdness with xrandr commands. If I can get the monitor working, xrandr works correctly every time.
Essentially, if the screen goes into power save mode, I am forced to reboot in order to wake it up. My other monitor is an HP ZR24w and I'm running a fully updated 14.04 on a desktop machine. I'm not sure what further info or log files might be useful, but let me know and I'll try to provide whatever I can. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1412730 Title: DELL U2415 monitor detection issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1412730/+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