I have a similar issue with an Intel sandy bridge graphic card, As for this bug report the issue started after upgrading to 15.10 ...
I can switch on the external monitor but this cause both the screen to start to have distorted images and not stable images ( basically not usable at all ) Kernel: 3.19.0-9-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1496697 Title: HDMI output gone after completing ubuntu updates To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1496697/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
