Context
I’ve had a weird issues in my laptop (carbon x1) which suddenly started to hanging processes and the laptop’s monitor got laggy (e.g not showing in real time what I typed). I’m using i3 in a Pop!_OS.
Solution
I’ve ended up in system76 article where they mention issues with external monitor and I’ve found the following command which solved my problems:
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source: https://support.system76.com/articles/hidpi-multi-monitor/