Thanks. It kind of looks like the Nvidia driver is directly aware of the USB-C/Thunderbolt port. So maybe it's not surprising then that the order of connection matters.
For now that suggests the bug is somewhere between the Nvidia driver and the kernel. ** Package changed: xorg-server (Ubuntu) => linux (Ubuntu) ** Summary changed: - External monitor does not connect on USB-C + [ThinkPad P1 Gen 4i][Nvidia T1200] External monitor does not connect on USB-C ** Changed in: linux (Ubuntu) Status: Incomplete => New ** Changed in: nvidia-graphics-drivers-510 (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1973145 Title: [ThinkPad P1 Gen 4i][Nvidia T1200] External monitor does not connect on USB-C To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+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