147 lines
4.3 KiB
Markdown
147 lines
4.3 KiB
Markdown
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# ROG Flow Z13 — Touchpad DWT & Palm Rejection Fix
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Fixes the **"Disable while typing"** checkbox being greyed out in KDE Plasma
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and enables proper palm rejection on the ASUS ROG Flow Z13 folio keyboard touchpad.
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**Device:** ROG Flow Z13 (2023 & 2025 models, USB `0b05:1a30`)
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**OS:** CachyOS / Arch Linux, KDE Plasma 6, Wayland
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---
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## The Problem
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The Z13's magnetic folio keyboard connects via **USB**. Because it's detachable,
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the kernel flags the USB device as `removable`. Systemd's `65-integration.rules`
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then sets:
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```
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ID_INPUT_TOUCHPAD_INTEGRATION=external
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```
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on the touchpad. **Libinput refuses to enable Disable-While-Typing (DWT) for
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external touchpads**, so KDE greys out the checkbox.
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The libinput package ships a built-in quirk (`50-system-asus.quirks`) that marks
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the **keyboard** interface as internal, but there is no libinput quirk attribute
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to mark a **touchpad** as internal. The keyboard was handled — the touchpad was not.
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### How the folio exposes itself
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| Event | Role | Status |
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|-------|------|--------|
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| `event3` | Vendor keys | — |
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| `event4` | Keyboard | Marked internal by libinput quirk |
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| `event7` | Mouse pointer | — |
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| `event8` | **Touchpad** | 🛑 Was marked external |
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The keyboard and touchpad share the same `LIBINPUT_DEVICE_GROUP`, so they *can*
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be paired for DWT — but only if **both** are internal.
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---
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## The Fix
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### Layer 1 — Mark the keyboard as internal
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**Already handled** by the system's built-in libinput quirk at
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`/usr/share/libinput/50-system-asus.quirks`:
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```ini
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[Asus ROG FLow Z13 2025 keyboard]
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MatchUdevType=keyboard
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MatchBus=usb
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MatchVendor=0x0B05
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MatchProduct=0x1A30
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AttrKeyboardIntegration=internal
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```
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The install script also creates a local override at
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`/etc/libinput/local-overrides.quirks` as a broader catch-all for any ASUS
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USB keyboard.
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### Layer 2 — Mark the touchpad as internal
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**A udev rule** (`/etc/udev/rules.d/99-rog-z13-touchpad.rules`) overrides the
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integration type after `65-integration.rules` has already set it to `external`:
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```udev
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ACTION=="add|change", SUBSYSTEM=="input", \
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ENV{ID_VENDOR_ID}=="0b05", ENV{ID_MODEL_ID}=="1a30", \
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ENV{ID_INPUT_TOUCHPAD}=="1", \
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ENV{ID_INPUT_TOUCHPAD_INTEGRATION}="internal"
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```
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**Why this works:**
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- Runs at priority **99** (after `65-integration.rules` at priority 65)
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- Only matches the Z13 folio (`0b05:1a30`)
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- Only affects the touchpad interface (`ID_INPUT_TOUCHPAD=1`)
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- Sets `ID_INPUT_TOUCHPAD_INTEGRATION=internal`, which libinput reads at runtime
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### The result
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With both keyboard + touchpad recognized as internal:
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1. **The "Disable while typing" checkbox becomes available** in KDE System
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Settings → Touchpad
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2. **DWT activates** — the touchpad is ignored for ~300–500ms after any keypress
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3. **Palm rejection improves** — libinput applies more aggressive defaults for
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internal touchpads (larger exclusion zones, lower palm pressure thresholds)
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---
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## Usage
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```bash
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# Clone the repo
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git clone ssh://git@forgejo.fifthdread.com:223/Fifthdread/rog-z13-trackpad-fix.git
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cd rog-z13-trackpad-fix
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# Run the install script (as root)
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sudo ./fix-rog-z13-trackpad.sh
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```
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Then log out and back in. Open **System Settings → Touchpad** — the
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"Disable touchpad when typing" checkbox should now be available.
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### Reverting
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```bash
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sudo rm /etc/udev/rules.d/99-rog-z13-touchpad.rules
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sudo rm /etc/libinput/local-overrides.quirks
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sudo udevadm control --reload-rules
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sudo udevadm trigger --subsystem-match=input
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```
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---
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## Troubleshooting
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**Verify the udev rule is loaded:**
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```bash
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udevadm info --query=property /dev/input/event8 | grep INTEGRATION
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# Should show: ID_INPUT_TOUCHPAD_INTEGRATION=internal
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```
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**Verify the keyboard quirk is applied:**
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```bash
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sudo libinput quirks list /dev/input/event4
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# Should show: AttrKeyboardIntegration=internal
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```
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**Verify DWT is enabled:**
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```bash
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sudo libinput list-devices | grep -A15 "Touchpad"
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# Should show: Disable-w-typing: enabled
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```
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> Your event numbers may differ (e.g. after a kernel update). Run
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> `sudo libinput list-devices` to find the correct ones.
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---
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## References
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- [libinput Device Quirks](https://wayland.freedesktop.org/libinput/doc/latest/device-quirks.html)
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- [Linux Touchpad Dev Guide — DWT](https://linuxtouchpad.org/libinput/2022/05/07/disable-while-typing.html)
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- [libinput — Disable While Typing](https://wayland.freedesktop.org/libinput/doc/latest/configuration.html#disable-while-typing)
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