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 Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1875015 Title: Ubuntu 20.04 and Displaylink is extremely slow Status in X.Org X server: Unknown Status in xorg-server package in Ubuntu: Confirmed Bug description: Using ubuntu 20.04 on displaylink docking with external monitor is totally slow, unusable. The GUI responds very slow, if you click, the command of the click goes on after about 3 seconds... if you type, all the letters are with the same lag, so it is totally unusable. Was using displaylink without any problem on 19.10 until yesterday, when I upgraded to 20.04. It is terrific. If i plug out the usb for the displaylink docking station, than the speed is back, and the system is ok, if I connect it to the docking station again, everything extremely slow again. Please investigate this asap, as it is unusable on displaylink docking stations. To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1875015/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
