I have this issue on 21.04 Thinkpad P1 when I use DP on the dock and turn the laptop monitor off.
The workaround for me was adding LIBGL_DRI3_DISABLE=true to the /etc/environment and reboot. I have nvidia card and read this workaround for an HDMI issue somewhere on the Nvidia forums, But it seems like it also solved my problem. -- 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/1875015 Title: Ubuntu 20.04 and Displaylink is extremely slow To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1875015/+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
