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linuxx11nixosxrandr
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Reputation: 893

Change X11 dpi on the fly on NixOS

I expect xrandr --dpi 180 to change the dpi from 90 to 180 on the fly per-session and thus downscale resolution, but nothing happens. Am I missing something? I was able to change the dpi with the silly hack of adding fonts.fontconfig.dpi=180 to /etc/nixos/configuration.nix then nixos-rebuild test, which is less than ideal.

To be very clear, here's my situation: 1. the default resolution is too low for my laptop screen and everything (fonts) looks painfully small. 2. I learned adding fonts.fontconfig.dpi=180 to /etc/nixos/configuration.nix on nixos can set the dpi to 180 from the default 96 so that everything has normal size (fonts). 3. However, I now sometimes open the vm on a monitor which has lower resolution than my laptop, and I'd like to change the dpi on the fly when switching between using the laptop screen and the monitor.

Upvotes: 3

Views: 2267

Answers (1)

Chris Stryczynski
Chris Stryczynski

Reputation: 34021

After changing the DPI via that setting, programs won't necessarily immediately react to it.

You may need to re-open certain applications to see the change.

Upvotes: 1

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