If you are using a USB-C dock then please see bug 1970495. Otherwise if you think the USB-C port might be wired directly to the Nvidia GPU then please see bug 1960865.
When the bug occurs next please: 1. Wait 10 seconds. 2. Reboot. 3. Run: journalctl -b-1 > prevboot.txt 4. Attach the resulting text file here. ** Package changed: xorg (Ubuntu) => nvidia-graphics-drivers-510 (Ubuntu) ** Also affects: xorg-server (Ubuntu) Importance: Undecided Status: New ** Changed in: nvidia-graphics-drivers-510 (Ubuntu) Status: New => Incomplete ** Changed in: xorg-server (Ubuntu) Status: New => Incomplete -- 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/1973145 Title: External monitor does not connect on USB-C To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-510/+bug/1973145/+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