Graphical glitches on external monitor only (optimus)


Just another newbie here who transferred over from Manjaro where I was using optimus-manager to deal with the whole hybrid graphics mess.

With EOS I couldn’t get optimus-manager working immediately so I modified my lightdm config by taking this LightDM config as inspiration from the arch wiki.

# File: /etc/lightdm/

xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto
xrandr --output HDMI-1-3 --primary --output eDP1 --left-of HDMI-1-3
# File: /etc/lightdm/lightdm.conf


This got the external monitor working… now on to the actual problem: on the external monitor (only), everytime a new window is opened, resized or something is highlighted, weird graphical glitches appear (and disappear within a second). They make the text within the window unreadable / garbled and it’s affecting the user experience quite a bit.

Wonder what you guys think of this.

My inxi -Fxxc0z --no-host output:

Thanks in advance for any input.

Try reading through here:

NVIDIA/Troubleshooting - ArchWiki (

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Thank you very much.

Turns out I hadn’t installed the nvidia driver properly.

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