diff --git a/README.md b/README.md
index 0af7a3a..5b24c87 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 NixOS configuration for my Framework 12 laptop aka chi. Everything here is subject to change, and is for my own personal use.
 
-The Framework hardware module, accelerometer-driven Niri rotation, on-screen keyboard, and optional touchscreen edge gestures make the convertible hardware usable outside a full desktop environment.
+The Framework hardware module, accelerometer-driven Niri rotation, manually toggled on-screen keyboard, rotation-aware touchscreen edge gestures, and Powertop tunings make the convertible hardware usable outside a full desktop environment.
 
 It's widely vibe coded togther, but seems to be stable. I'm not doing anything that difficult here, and goes to show that anyone can waste electricity.
 
@@ -12,7 +12,7 @@ It's widely vibe coded togther, but seems to be stable. I'm not doing anything t
 hosts/chi/          — host-specific config (chi, a Framework 12 laptop)
 modules/common.nix  — shared settings (locale, firewall, fonts, nix settings)
 home/               — Home Manager modules, one file per topic
-                      (shell, apps, emacs, niri, waybar, foot, khal, stylix, opencode)
+                      (shell, apps, emacs, niri, ironbar, tablet, foot, khal, stylix, opencode)
 wallpapers/         — wallpapers (wp2002041.jpg also generates the stylix theme)
 ```
 
diff --git a/home/tablet.nix b/home/tablet.nix
index 9e31e4f..cab6764 100644
--- a/home/tablet.nix
+++ b/home/tablet.nix
@@ -4,15 +4,66 @@
   ...
 }: let
   niri = "${config.programs.niri.package}/bin/niri";
-  touchscreen = "/dev/input/by-path/pci-0000:00:15.1-platform-i2c_designware.1-event";
+  touchscreen = "/dev/input/by-path/pci-0000:00:15.0-platform-i2c_designware.0-event";
   tabletGestures = pkgs.writeShellScript "tablet-gestures" ''
-    exec ${pkgs.lisgd}/bin/lisgd \
-      -d ${touchscreen} \
-      -t 120 \
-      -m 900 \
-      -g "2,LR,L,*,R,${niri} msg action focus-column-left" \
-      -g "2,RL,R,*,R,${niri} msg action focus-column-right" \
-      -g "2,DU,B,*,R,${niri} msg action toggle-overview"
+    set -eu
+
+    lisgd_pid=""
+    sensor_pid=""
+    sensor_fifo="''${XDG_RUNTIME_DIR:-/tmp}/tablet-gestures-$$.fifo"
+
+    cleanup() {
+      if [ -n "$lisgd_pid" ]; then
+        kill "$lisgd_pid" 2>/dev/null || true
+        wait "$lisgd_pid" 2>/dev/null || true
+      fi
+      if [ -n "$sensor_pid" ]; then
+        kill "$sensor_pid" 2>/dev/null || true
+        wait "$sensor_pid" 2>/dev/null || true
+      fi
+      rm -f "$sensor_fifo"
+    }
+
+    start_lisgd() {
+      case "$1" in
+        normal) orientation=0 ;;
+        right-up) orientation=1 ;;
+        bottom-up) orientation=2 ;;
+        left-up) orientation=3 ;;
+        *) return ;;
+      esac
+
+      if [ -n "$lisgd_pid" ]; then
+        kill "$lisgd_pid" 2>/dev/null || true
+        wait "$lisgd_pid" 2>/dev/null || true
+      fi
+      ${pkgs.lisgd}/bin/lisgd \
+        -d ${touchscreen} \
+        -o "$orientation" \
+        -t 120 \
+        -m 900 \
+        -g "2,LR,L,*,R,${niri} msg action focus-column-left" \
+        -g "2,RL,R,*,R,${niri} msg action focus-column-right" \
+        -g "2,DU,B,*,R,${niri} msg action toggle-overview" &
+      lisgd_pid=$!
+    }
+
+    trap cleanup EXIT INT TERM
+
+    mkfifo "$sensor_fifo"
+    ${pkgs.iio-sensor-proxy}/bin/monitor-sensor --accel >"$sensor_fifo" &
+    sensor_pid=$!
+
+    while IFS= read -r line; do
+      case "$line" in
+        *"orientation: normal"*|*"orientation changed: normal") start_lisgd normal ;;
+        *"orientation: right-up"*|*"orientation changed: right-up") start_lisgd right-up ;;
+        *"orientation: bottom-up"*|*"orientation changed: bottom-up") start_lisgd bottom-up ;;
+        *"orientation: left-up"*|*"orientation changed: left-up") start_lisgd left-up ;;
+      esac
+    done <"$sensor_fifo"
+
+    exit 1
   '';
 in {
   home.packages = [
@@ -36,7 +87,7 @@ in {
 
     tablet-gestures = {
       Unit = {
-        Description = "Experimental Framework touchscreen edge gestures";
+        Description = "Rotation-aware Framework touchscreen edge gestures";
         PartOf = ["graphical-session.target"];
         After = ["graphical-session.target"];
       };
diff --git a/hosts/chi/configuration.nix b/hosts/chi/configuration.nix
index 3a2d20d..b059d49 100644
--- a/hosts/chi/configuration.nix
+++ b/hosts/chi/configuration.nix
@@ -107,6 +107,7 @@
     opencode
     prismlauncher
     nix-output-monitor
+    powertop
     age
     unzip
   ];
@@ -119,6 +120,9 @@
 
   # Laptop power management (Framework 12, Intel)
   services.power-profiles-daemon.enable = true;
+  # Apply peripheral and device power-saving tunables at boot. PPD continues
+  # to manage the selectable CPU energy profiles at runtime.
+  powerManagement.powertop.enable = true;
   services.thermald.enable = true;
   services.fwupd.enable = true;
   # UPower daemon — ironbar's battery module reads battery state over zbus
diff --git a/notes.md b/notes.md
index 667338e..a57d5ac 100644
--- a/notes.md
+++ b/notes.md
@@ -4,10 +4,10 @@
 
 The `nixos-hardware` Framework 12 module loads `pinctrl_tigerlake` in the initrd before `soc_button_array`, enables IIO sensors, installs `framework_tool`, and keeps firmware updates available through `fwupd`. `services.iio-niri` forwards accelerometer orientation to Niri for the internal `eDP-1` panel.
 
-`home/tablet.nix` provides two optional user services:
+`home/tablet.nix` provides two user services:
 
-- `tablet-keyboard.service` keeps `wvkbd` hidden and ready to toggle from Ironbar or `Mod+Shift+K`.
-- `tablet-gestures.service` maps two-finger swipes from the left/right edges to column navigation and a two-finger swipe from the bottom edge to Niri's overview.
+- `tablet-keyboard.service` keeps `wvkbd` hidden and ready to toggle from Ironbar or `Mod+Shift+K`. It intentionally does not open automatically when entering tablet mode.
+- `tablet-gestures.service` reads the internal ILIT2901 touchscreen, maps two-finger swipes from the left/right edges to column navigation, and maps a two-finger swipe from the bottom edge to Niri's overview. It follows accelerometer events and restarts `lisgd` with the matching orientation after the screen rotates.
 
 The gestures are experimental and can interfere with multi-touch drawing applications. Disable them with:
 
@@ -25,6 +25,16 @@ systemctl status iio-sensor-proxy.service
 systemctl --user status iio-niri.service tablet-keyboard.service tablet-gestures.service
 ```
 
+The host enables NixOS's Powertop service, which applies `powertop --auto-tune` once at boot. `power-profiles-daemon` remains enabled for switching CPU energy profiles. If a peripheral develops autosuspend problems, test without the tunings using `sudo systemctl stop powertop.service` before disabling `powerManagement.powertop.enable`.
+
+Sources used for this setup:
+
+- [Niri switch events](https://niri-wm.github.io/niri/Configuration%3A-Switch-Events.html) documents tablet-mode hooks. They are not used to show the keyboard automatically here.
+- [Niri touchscreen gestures discussion](https://github.com/niri-wm/niri/discussions/463) covers `lisgd`, rotation handling, Roland, and experimental native gesture work.
+- [Framework 12 Sway tips](https://community.frame.work/t/sway-on-the-framework-laptop-12/73173) demonstrates the practical `wvkbd`, rotation, and touch-sized bar-control pattern.
+- [Framework 12 tablet requirements](https://community.frame.work/t/what-are-the-linux-system-requirements-for-tablet-mode/71466) and the [tablet-mode recovery tracking thread](https://community.frame.work/t/fw12-problems-returning-from-tablet-mode-tracking-thread/71631) cover kernel module ordering and hardware failure modes.
+- [The Tangled repository](https://tangled.org/molly.computer/nixos/tree/master) is the primary remote for this configuration. Tangled's public search currently exposes few comparable Framework 12 configurations.
+
 ### software to investigate
 
 - `rnote`: touch-first handwritten notes and sketching.
@@ -34,9 +44,13 @@ systemctl --user status iio-niri.service tablet-keyboard.service tablet-gestures
 - `papers`: document and PDF reader with a compact GTK interface.
 - `kdeconnect` or `localsend`: phone integration and local file transfer.
 - `kooha`: simple Wayland screen recording.
-- `powertop` and `powerstat`: measure battery use before adding power tweaks.
+- `powerstat`: compare actual battery use before and after Powertop tuning; `sudo powertop` provides interactive wakeup and device diagnostics.
+- `swayidle`: automatic lock, display power-off, and suspend under Niri.
+- `zramSwap`: compressed memory fallback during heavy builds or games; less urgent while the system has ample disk swap.
+- Framework EC charge limits: cap charging around 80% for battery longevity after confirming support and preferred travel behavior.
 - `unl0kr`: touchscreen initrd unlock if disk encryption is added later.
 - `roland`: Niri-focused edge gesture daemon with better edge detection than `lisgd`, but it is lightly maintained and not packaged in nixpkgs.
+- `sysboard`: another Niri-compatible on-screen keyboard worth comparing with `wvkbd`.
 - `squeekboard`: richer input-method behavior if its standalone compositor integration improves.
 
 ## pulling this config to a new system