Merge pull request #207563 from hercules-ci/flaky-nixosTests.keymap

Fix flaky `nixosTests.keymap`

nixos/tests/keymap.nix

@@ -64,7 +64,6 @@ let
 
               # wait for reader to be ready
               machine.wait_for_file("${readyFile}")
-              machine.sleep(1)
 
               # send all keys
               for key in inputs:
@@ -78,9 +77,18 @@ let
       with open("${pkgs.writeText "tests.json" (builtins.toJSON tests)}") as json_file:
           tests = json.load(json_file)
 
+      # These environments used to run in the opposite order, causing the
+      # following error at openvt startup.
+      #
+      # openvt: Couldn't deallocate console 1
+      #
+      # This error did not appear in successful runs.
+      # I don't know the exact cause, but I it seems that openvt and X are
+      # fighting over the virtual terminal. This does not appear to be a problem
+      # when the X test runs first.
       keymap_environments = {
-          "VT Keymap": "openvt -sw --",
           "Xorg Keymap": "DISPLAY=:0 xterm -title testterm -class testterm -fullscreen -e",
+          "VT Keymap": "openvt -sw --",
       }
 
       machine.wait_for_x()