It sounds like the Nvidia driver is not happy with the new kernel. Please try booting an older kernel or forcefully reinstalling the Nvidia kernel driver:
sudo apt install --reinstall nvidia-dkms-460 and then reboot. You can also find other kernels to test at https://kernel.ubuntu.com /~kernel-ppa/mainline/?C=M;O=D ** Package changed: xorg (Ubuntu) => linux-hwe-5.8 (Ubuntu) ** Also affects: nvidia-graphics-drivers-460 (Ubuntu) Importance: Undecided Status: New ** Changed in: linux-hwe-5.8 (Ubuntu) Importance: Undecided => High ** Changed in: nvidia-graphics-drivers-460 (Ubuntu) Importance: Undecided => High ** Summary changed: - After update display resolution is only 640X480 + [nvidia] After update display resolution is only 640X480 ** Tags added: nvidia regression-update -- 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/1919364 Title: [nvidia] After update display resolution is only 640X480 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.8/+bug/1919364/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
