System hangs out/freezes on external monitor after last update

Support Graphics & Display
,
20

I have some trouble in one time
For me help Downgrade kscreen and libkscreen to 5.25.1

  1. Install downgrade
    sudo pamac install downgrade
  2. Enter the command
    sudo DOWNGRADE_FROM_ALA=1 downgrade kscreen libkscreen
    and choose verison 5.25.1
  3. Reboot
    sudo reboot

i found this in other topic

Icons on the taskbar are not visible (drivers problem)

I too have nvidia gpu + intel gpu
I try delete cache, edit /etc/default/grub, reinstall plasma \ xorg

But now we have only 2 work way how to fix it

  1. Downgrade kscreen and libkscreen to 5.25.1<=
  2. Install Plasma LTSC ( include kscreen and libkscreen to 5.25.1<= )
  3. Not per-moment - When your log on in plasma, try to upload new wallper< you screen to bee a black and all to be normal ( after logout, need do it again )

I use video-hybrid-intel-nvidia-prime
and for me second display output only normal in thunderbolt → hdmi

Second fix your can try -
Install optimus manager
and use only Nvidia gpu
optimus-manager --switch nvidia