I fixed my problem on Dell laptop by changing Screensaver (XScreenSaver 5.34) settings. Display Modes Mode: Blank Screen Only or Disable Screen Saver
I guess the screen saver program was not working well. I glimpsed the monitor had weird colors. Laptop Lid is closed: both Switch off display and Lock screen work after the change. -- 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/49521 Title: Screen locks up black on laptop lid close. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/49521/+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
