System hangs out/freezes on external monitor after last update

Done. The same issue, with additional drawbacks: empty (non-recognized filled “grey”) taskbar icons and ugly, small fonts in window titles.

you can also try changing refrehs rates on the external monitor;
also change the resolution, start with the lowest, click apply, and then increase one at a time…

if it didnt helped, try the 470 version:
sudo mhwd -r pci video-hybrid-intel-nvidia-prime
install the 470:
sudo mhwd -r pci video-hybrid-intel-nvidia-470xx-prime

When I check Replica of: builtin screen for external monitor - it “copies” the output, but that’s not what’s needed.
When I use Fn + F8 shortcut I’m able to dim the builtin screen and get the output on external, but it slows down the system extremely.

  1. should I proceed with sudo mhwd -i pci video-hybrid-intel-nvidia-470xx-prime ?
  2. how to recover back normal taskbar icons and window fonts ?

did you tried the different resolutions from system settings/ display configuration?
if it didnt helped, proceed with the installation of nvidia470…

but reading your issues with ugly fonts, icons, taskbar, you describing what others have reported…

yes, does not give a desirable effect

i would no longer bother with installing the 470 version, but try downgrading kscreen and libkscreen, as described here:

install the downgrade package, run the command, and downgrade to the previous version, not the version mentioned in the link, reboot

I’ve installed video-hybrid-intel-nvidia-470xx-prime, rebooted and see no changes.
The icons and fonts has recovered.
I noticed that even just checking off Enabled on “Buil-in Screen” causes system to hang out/slow down.
Should I proceed with sudo DOWNGRADE_FROM_ALA=1 downgrade kscreen libkscreen ?

yes, you have nothing to lose… but you have to install the package downgrade first, then proceed with the command, and select the previous versions, where it worked, reboot … (thats assuming kscreen is the cause)

well, I did a couple of downgrades up to 5.25 … and it did not helped.
It’s unclear how many downgrades(with reboots) should be made.

well thats unfortunate… did you downgrade both of the packages, the kscreen + libkscreen?
do you have a timeshift backup?
also provide logs, maybe there will be something:
journalctl -b0 -p4 --no-pager



(forum throws error due to big file, here’s a link)

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

you should use timeshift, very usefull …
in the logs there was some logs referring to bbswitch, and i think 6 coredumps of plasmashell…
post output from:
pacman -Qm
pacman -Qs 'optimus|bbswitch|bumblebee'

sorry for delay (I’ve been under power cut due to russian fascists fire attacks to our critical infrastructure)
I’ve installed timeshift (though current snapshots are “erroneous”)

$ pacman -Qm
abr2gbr 1.0.2-1
advancecomp 2.1-3
audio-recorder 3.3.4-1
crow-translate 2.9.1-1
cryptoplugin 1.2.2-2
deadbeef 1.8.8-3
djvu2pdf 0.9.2-1
electron12 12.2.3-4
etcher 1.7.9-1
exaile 4.1.1-2
extundelete 0.2.4-5
fotoxx 22.30-1
glib 1.2.10-18
google-chrome 105.0.5195.125-1
jdk 19.0.1-1
jdk8 8u251-1
jre 19.0.1-1
kde-servicemenus-rootactions 2.9.1-1
key-mapper-git 1.0.0+62+g3e20cb9-1
libcanberra-gstreamer 0.30+2+gc0620e4-3
libdbusmenu-qt4 0.9.3+16.04.20160218-2
libguess 1.2-4
masterpdfeditor-free 4.3.89-1
metis 5.1.0.p10-2
noto-fonts-compat 20151217-1
ocrmypdf 13.2.0-1
openssl-1.0 1.0.2.u-1
package-query 1.12-1
pdf-xchange 9.2.359.0-1
pdfsam 4.2.10-1
playonlinux 4.3.4-4
python-coloredlogs 15.0.1-2
python2 2.7.18-5
qpdfview 0.4.18-2
qt4 4.8.7-34
qt5-canvas3d 5.12.4-1
qt5-webkit 5.212.0alpha4-18
sky 2.1.7801-1
sni-qt 0.2.7+17.04.20170112-1
teamviewer 15.25.5-1
trimage 1.0.6-2
ttf-wps-fonts 1.0-5
tuxguitar 1.5.4-2
tuxguitar-common 1.5.4-1
tuxguitar-fluidsynth 1.2.20-1
wkhtmltopdf 0.12.6-1
wps-office-extension-russian-dictionary 20131121-4
wps-office-extension-ukrainian-dictionary 20131121-4
wps-office-fonts 1.0-2
xdg-su 1.2.3-2
xf86-input-keyboard 1.9.0-3
xf86-input-mouse 1.9.3-1
yaourt 1.9-1
zoom 5.9.1-1

And no output for pacman -Qs 'optimus|bbswitch|bumblebee'.

Thanks, I’ve already tried downgrade kscreen and libkscreen to 5.25.1 - it did not help.
As for downgrading to plasma LTS 5.25: I’m not sure if that could effect newly installed kde applications that rely on the latest version.

not sure if optimus is better than nvidia-prime overall.

nothing suspicious in the pacman -Qm output…
you had something in the logs regarding bbswitch…
switching completely to nvidia could be worth a try… use envycontrol:
pamac build envycontrol
when done, switch to nvidia:
sudo envycontrol -s nvidia
it will prompt you for reboot, so do it, and see if that helps…

Doesn’t it eliminate the role of Intel graphics card as the one that freeing up the Nvidia card from full load?

The confrontational “activity” between current nvidia-prime and envycontrol is excluded?

well yes, you will be 100% on nvidia …
but this is only for testing purposes…
and what activity? dont understand what you mean

I mean: could nvidia-prime somehow conflict with envycontrol (when both installed) in managing hybrid configuration?

no it doesnt conflict, i have also intel+nvidia prime, and use envycontrol, and no issues …