diff --git a/.config/nvim/lazy-lock.json b/.config/nvim/lazy-lock.json
index 3a97f25e..52f9c7f9 100644
--- a/.config/nvim/lazy-lock.json
+++ b/.config/nvim/lazy-lock.json
@@ -38,5 +38,6 @@
   "vim-fugitive": { "branch": "master", "commit": "61b51c09b7c9ce04e821f6cf76ea4f6f903e3cf4" },
   "vim-repeat": { "branch": "master", "commit": "65846025c15494983dafe5e3b46c8f88ab2e9635" },
   "vim-sleuth": { "branch": "master", "commit": "be69bff86754b1aa5adcbb527d7fcd1635a84080" },
-  "vim-surround": { "branch": "master", "commit": "3d188ed2113431cf8dac77be61b842acb64433d9" }
+  "vim-surround": { "branch": "master", "commit": "3d188ed2113431cf8dac77be61b842acb64433d9" },
+  "vimtex": { "branch": "master", "commit": "2e1bbabeb2c34bb17d7bc8cfdf8f95b16dd0db0c" }
 }
diff --git a/.config/nvim/lua/_lazy.lua b/.config/nvim/lua/_lazy.lua
index 3b2e9541..9e228094 100644
--- a/.config/nvim/lua/_lazy.lua
+++ b/.config/nvim/lua/_lazy.lua
@@ -114,6 +114,12 @@ local plugins = {
     },
     -- The haskell lexer
     "vim-scripts/alex.vim",
+    {
+        -- https://github.com/lervag/vimtex#lazynvim
+        "lervag/vimtex",
+        lazy = false,
+        version = "^2",
+    },
     {
         "nvim-telescope/telescope.nvim",
         branch = "0.1.x",
diff --git a/nix/configurations/vanadium/nixos/display.nix b/nix/configurations/vanadium/nixos/display.nix
index cccc8ef2..43e9f953 100644
--- a/nix/configurations/vanadium/nixos/display.nix
+++ b/nix/configurations/vanadium/nixos/display.nix
@@ -69,7 +69,7 @@
               device, # obtain with `xrandr`
               brightness, # [0..1]
             }:
-            singleton "10_xrandr_brightness" ''
+            singleton "10_xrandr_brightness" /* bash */ ''
               ${lib.getExe pkgs.xorg.xrandr} --output ${device} --brightness ${toString brightness}
             '';
 
@@ -79,7 +79,7 @@
               modelName, # obtain with `ddcutil detect`
               brightness, # [0..1]
             }:
-            singleton "10_ddc_brightness" ''
+            singleton "10_ddc_brightness" /* bash */ ''
               ${lib.getExe pkgs.ddcutil} --model ${modelName} setvcp 10 ${
                 toString (builtins.floor (brightness * 100))
               }
@@ -90,7 +90,7 @@
               modelName, # obtain with `ddcutil detect`
               contrast, # [0..1]
             }:
-            singleton "10_ddc_contrast" ''
+            singleton "10_ddc_contrast" /* bash */ ''
               ${lib.getExe pkgs.ddcutil} --model ${modelName} setvcp 12 ${
                 toString (builtins.floor (contrast * 100))
               }
diff --git a/nix/packages/by-name/tmux-sessionizer/package.nix b/nix/packages/by-name/tmux-sessionizer/package.nix
index 63ebfc67..63c7cbc1 100644
--- a/nix/packages/by-name/tmux-sessionizer/package.nix
+++ b/nix/packages/by-name/tmux-sessionizer/package.nix
@@ -8,24 +8,6 @@
   symlinkJoin,
 }:
 let
-  tmux-register-session = writeShellApplication {
-    name = "__tmux-register-session";
-    runtimeInputs = [ tmux ];
-    text = ''
-      last=/tmp/TMUX_LAST
-
-      # bail if tmux not running
-      if ! pgrep tmux >/dev/null 2>&1; then
-        exit 1
-      fi
-
-      this="$(tmux display-message -p '#S')"
-      if [ ! -f "$last" ] || [ "$(cat "$last")" != "$this" ]; then
-          echo "$this" >"$last"
-      fi
-    '';
-  };
-
   tmux-maybe-create = writeShellApplication {
     name = "__tmux-maybe-create";
     runtimeInputs = [
@@ -94,7 +76,6 @@ let
       esac
 
       # effects
-      ${lib.getExe tmux-register-session} || :
       ${lib.getExe tmux-maybe-create} "$session_name" "$selected"
       ${lib.getExe tmux-attach-or-switch} "$session_name"
     '';
@@ -103,7 +84,6 @@ in
 symlinkJoin {
   name = "tmux-sessionizer";
   paths = [
-    tmux-register-session
     tmux-maybe-create
     tmux-attach-or-switch
     tmux-sessionizer