Arch Linux

hermanokm

Member

Registered: 2021-11-09

Posts: 3

External monitor working only in hybrid mode (X11) [SOLVED]

Hi,

After fresh installing arch and thereafter KDE and sddm I experimented an issue I was having with another linux install I had: my external monitor got sluggish when I closed my laptop's lid. Trying to solve that issue, I found out that now my external monitor is working only when my graphics cards are operating in hybrid mode, i.e., when my integrated Intel and dedicated nvidia cards switch automatically according to the load. When I change to use either my Intel or my nvidia GPU, my external display turns off and disappears from xrandr.

After searching extensively about this problem, I couldn't find anything. Could anyone please help?

Regards!

Last edited by hermanokm (2021-11-10 00:56:12)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,974

Re: External monitor working only in hybrid mode (X11) [SOLVED]

The external output is likely wired to the nvidia chip (pretty common) so the nvidia chip *has* to ba available as a crtc hub, whether you're working on the intel or nvidia chip.

You should maybe extensively search the wiki, https://wiki.archlinux.org/title/NVIDIA_Optimus & https://wiki.archlinux.org/title/PRIME because https://wiki.archlinux.org/title/PRIME#Reverse_PRIME …

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hermanokm

Member

Registered: 2021-11-09

Posts: 3

Re: External monitor working only in hybrid mode (X11) [SOLVED]

Thank you very much for your response, despite all the irony. I tried the pages you suggested but could not get it to work. I will try again though and let you know the results.

hermanokm

Member

Registered: 2021-11-09

Posts: 3

Re: External monitor working only in hybrid mode (X11) [SOLVED]

Hi! I solved it by uninstalling optimus-manager (I forgot to uninstall after the first try) and by adding the line Option "PrimaryGPU" "yes" to the /etc/X11/xorg.conf.d/10-nvidia-drm-outputclass.conf file followed by mkinitcpio -P.

Thanks again for the quick response.