dotfiles/modules/nixos/hardware/monitors.nix

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{ config, pkgs, lib, ... }: {
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config = lib.mkIf config.gui.enable {
environment.systemPackages = with pkgs;
[
ddcutil # Monitor brightness control
];
# Reduce blue light at night
services.redshift = {
enable = true;
brightness = {
day = "1.0";
night = "1.0";
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};
};
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# Detect monitors (brightness) for ddcutil
hardware.i2c.enable = true;
# Grant main user access to external monitors
users.users.${config.user}.extraGroups = [ "i2c" ];
services.xserver.displayManager = {
# Put the login screen on the left monitor
lightdm.greeters.gtk.extraConfig = ''
active-monitor=0
'';
# Set up screen position and rotation
setupCommands = ''
${pkgs.xorg.xrandr}/bin/xrandr --output DisplayPort-1 \
--mode 1920x1200 \
--pos 1920x0 \
--rotate left \
--output HDMI-A-0 \
--primary \
--mode 1920x1080 \
--pos 0x560 \
--rotate normal \
--output DVI-0 --off \
--output DVI-1 --off \
'';
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};
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};
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}