dotfiles/modules/hardware/monitors.nix

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{ pkgs, lib, gui, identity, ... }: {
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# Timezone required for Redshift schedule
imports = [ ../system/timezone.nix ];
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config = lib.mkIf 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";
};
};
# Detect monitors (brightness)
hardware.i2c.enable = true;
# Grant user access to external monitors
users.users.${identity.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-0 \
--mode 1920x1200 \
--pos 1920x0 \
--rotate left \
--output HDMI-0 \
--primary \
--mode 1920x1080 \
--pos 0x559 \
--rotate normal \
--output DVI-0 --off \
--output DVI-1 --off \
'';
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};
};
}