This sounds like a combination of bug 1769383 and something else. Can you please provide a photo of the issue so we can figure out what the second part is?
** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu) ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete ** Tags added: nvidia ** Also affects: gdm3 (Ubuntu) Importance: Undecided Status: New ** Changed in: gdm3 (Ubuntu) Status: New => Incomplete ** Summary changed: - No unlock screen + [nvidia] Lock screen is a black background with pixel garbage. Bitmap garbage flashes on the screen when interacting with anything. ** Summary changed: - [nvidia] Lock screen is a black background with pixel garbage. Bitmap garbage flashes on the screen when interacting with anything. + [nvidia] After resume the unlock screen is a black background with pixel garbage. Bitmap garbage flashes on the screen when interacting with anything. ** Tags added: resume suspend-resume -- 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/1809407 Title: [nvidia] After resume the unlock screen is a black background with pixel garbage. Bitmap garbage flashes on the screen when interacting with anything. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1809407/+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