From 07b844265646ffce5f1ff33efa88aec3e2f3642f Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Mon, 10 Oct 2016 09:22:04 +0100
Subject: [PATCH] x11 module: don't restart the display manager indefinitely

If the display managers crashes continuously in loops it prevents the
user from switching to the console and try to fix things. Especially
when using the "auto" display manager it can happen quite easily.
---
 nixos/modules/services/x11/xserver.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index 6c6a1e79ed0e..61308f7d1287 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -529,6 +529,10 @@ in
           Restart = "always";
           RestartSec = "200ms";
           SyslogIdentifier = "display-manager";
+          # Stop restarting if the display manager stops (crashes) 3 times
+          # in 3 seconds.
+          StartLimitInterval = "3s";
+          StartLimitBurst = "3";
         };
       };