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{ config, lib, pkgs, ... }:
with lib;
let
enabled = elem "displaylink" config.services.xserver.videoDrivers;
evdi = config.boot.kernelPackages.evdi;
displaylink = pkgs.displaylink.override {
inherit evdi;
};
in
{
config = mkIf enabled {
boot.extraModulePackages = [ evdi ];
# Those are taken from displaylink-installer.sh and from Arch Linux AUR package.
services.udev.packages = [ displaylink ];
powerManagement.powerDownCommands = ''
#flush any bytes in pipe
while read -n 1 -t 1 SUSPEND_RESULT < /tmp/PmMessagesPort_out; do : ; done;
#suspend DisplayLinkManager
echo "S" > /tmp/PmMessagesPort_in
#wait until suspend of DisplayLinkManager finish
if [ -f /tmp/PmMessagesPort_out ]; then
#wait until suspend of DisplayLinkManager finish
read -n 1 -t 10 SUSPEND_RESULT < /tmp/PmMessagesPort_out
fi
'';
powerManagement.resumeCommands = ''
#resume DisplayLinkManager
echo "R" > /tmp/PmMessagesPort_in
'';
systemd.services.dlm = {
description = "DisplayLink Manager Service";
after = [ "display-manager.service" ];
conflicts = [ "getty@tty7.service" ];
path = [ pkgs.kmod ];
serviceConfig = {
ExecStart = "${displaylink}/bin/DisplayLinkManager";
Restart = "always";
RestartSec = 5;
};
preStart = ''
mkdir -p /var/log/displaylink
modprobe evdi
'';
};
};
}
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