Ubuntu 20.04 - Disable laptop built in monitor slows down the system
I am facing the same problem.
For me, I am using a Dell XPS Laptop and using it with Lenovo docking station (which also uses DisplayLink chipset) however downgrading the xserver didn't help me.
As a workaround, for now, try this command
xrandr --output eDP-1 --auto
eDP-1 refers to my laptop's internal monitor, you can find out your internal monitor using:
xrandr -q
It will list all the monitors and display settings possible, look for Screen 0 and use the value mentioned.
While there are many threads referring to this problem, one of them being the Displaylink driver issue (in case you are using DisplayLink Docks).
Hope it helps!
Cheers!
Ranjan Batra
I have had the same issue while using DisplayLink on my Dell XPS with Ubuntu 20.04.
It has long discussed in the DisplayLink evdi GitHub repository.
It is an issue in the xserver-xorg-core package, and as of now (July 17th 2021) seems to not be fixed in Ubuntu 20.04 as I have my system up to date. You can install anyway the package with the fix as said at: https://www.displaylink.org/forum/showthread.php?t=67148
- Download the package from: https://www.displaylink.com/downloads/file?d=310
- Unzip the file and execute
sudo dpkg -i xserver-xorg-core_1.20.8-2ubuntu2_amd64.deb
I am not sure if a restart was needed, but I did it anyway and it works fine now! :)
If you want to rollback to the default xserver-xorg-core version from the Ubuntu repository you can just execute sudo apt-get install --reinstall xserver-xorg-core