I can't recommend this patch. After patch it caused xorg-server as very unstable and crashing for me (i have fresh install Linux Mint Mate). (
https://gitlab.freedesktop.org/mesa/mesa/-/issues/3468) I only install last xorg-server from update center + my laptop display stayed as active.
After return back to lastest xorg-server it seems all fine. But yes, laptop display is still not fixed (
https://gitlab.freedesktop.org/xorg/.../-/issues/1028). Keep your laptop display turned on.
I will wait for any proper displaylink version + xorg. It's a shame.