Closing again. In my case this was probably caused by a hardware failure: the fan on the graphics card had died.
** Changed in: nvidia-graphics-drivers-180 (Ubuntu) Status: New => Invalid -- Display gets corrupted and garbled every 5-7 minutes when using compiz. VT switch which takes ~1min required to reset screen https://bugs.launchpad.net/bugs/309739 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs