I had exactly the same problem constantly since several years with different Ubuntu versions and different nvidia drivers.
After adding agp=off to the GRUB_CMDLINE_LINUX_DEFAULT in the grub config the strange black dots problem is completely gone! :-) ...maybe this helps someone too. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers-180 in Ubuntu. https://bugs.launchpad.net/bugs/421048 Title: Black dots appear on screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-180/+bug/421048/+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