Public bug reported: I upgraded my xubuntu 13.10 to 14.04 recently. When I turn the monitor off and on, it only shows "no input signal". I have to restart x to bring it back to work. This never happened on 13.10. Booting from xubuntu 14.04 livecd or a clean installion of xubuntu 14.04 gives the same problem. I tried xset dpms force off/suspend/standby, the monitor works fine after resuming. So i suppose it's not dpms to blame. My graphics card is Intel HD4600 and my monitor is Dell UP3214Q. The monitor is connected with a displayport cable. Enable or disable the displayport 1.2 setting of the monitor doesn't change anything. This issue does not occurs on another computer (with nVidia gfx card+Dell U2713HM+DVI cable)
Reinstall 13.10 solved the problem. ** Affects: ubuntu Importance: Undecided Status: New ** Tags: 14.04 black intel screen trusty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1313539 Title: monitor shows black screen and "no input signal" after turning the monitor off and on manually To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1313539/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs