Thanks for the bug report. It looks like this is probably a bug in the nouveau graphics driver, and most likely the HDMI port is connected to your Nvidia GPU. The nouveau driver is also logging errors which may or may not be related to this bug.
Please open the 'Additional Drivers' app and use it to install an official Nvidia driver instead. ** Tags added: amdgpu dualgpu hybrid nouveau ** Package changed: xorg (Ubuntu) => linux (Ubuntu) ** Summary changed: - Terribly flicking and blicking HDMI-port display + [nouveau] Terribly flicking and blicking HDMI-port display -- 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/2006370 Title: [nouveau] Terribly flicking and blicking HDMI-port display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2006370/+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
