Please try setting the external monitor to a lower resolution like 1920x1080. If the bug then stops happening it would suggest a higher quality display cable is needed.
** Tags added: multimonitor suspend-resume ** Package changed: xorg (Ubuntu) => linux (Ubuntu) ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Status: New => Incomplete ** Changed in: mutter (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/2067143 Title: ‘no signal’ after monitor sleep or monitor turned off To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2067143/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs