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# This file defines some configuration options which disable the screen. This
# is only relevant because this host is an old laptop running as a server.
{ pkgs, config, lib, ... }:
let
# The path to the device.
device-path = "/sys/class/backlight/intel_backlight";
# The systemd device unit which corresponds to `device-path`.
device-unit = "sys-devices-pci0000:00-0000:00:02.0-drm-card0-card0\\x2deDP\\x2d1-intel_backlight.device";
in
{
# Disable sleep on lid close.
services.logind =
let
lidSwitchAction = "ignore";
in
{
lidSwitchExternalPower = lidSwitchAction;
lidSwitchDocked = lidSwitchAction;
lidSwitch = lidSwitchAction;
};
# Don't store screen brightness between boots. We always want to turn off the
# screen.
#
# See: https://wiki.archlinux.org/title/backlight#Save_and_restore_functionality
# See: https://github.com/NixOS/nixpkgs/blob/990398921f677615c0732d704857484b84c6c888/nixos/modules/system/boot/systemd.nix#L97-L101
systemd.suppressedSystemUnits = [ "[email protected]" ];
# FIXME: Figure out how to enable screen when on-device debugging is necessary.
# Create a new service which turns off the display on boot.
#
# See: https://nixos.wiki/wiki/Backlight#.2Fsys.2Fclass.2Fbacklight.2F...
# See: https://superuser.com/questions/851846/how-to-write-a-systemd-service-that-depends-on-a-device-being-present
systemd.services.disable-screen =
{
requires = [ device-unit ];
after = [ device-unit ];
wantedBy = [ device-unit ];
serviceConfig.Type = "oneshot";
script = ''
tee ${device-path}/brightness <<<0
'';
};
warnings = lib.optional config.my.modules.graphics.enable
"You have enabled a graphical environment but the screen is still being disabled";
}
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