[Bug 2142386] [NEW] Touchpad SYNA3602:00 stops responding to movement after 5-10 minutes of inactivity (kernel 6.17.0-8-generic)

Public bug reported:

After upgrading to Ubuntu 25.10 with kernel 6.17.0-8-generic, the built-
in touchpad (SYNA3602:00 093A:0255) stops responding to movement after
about 5-10 minutes of inactivity.

Symptoms:
- Touching the pad wakes up the screen (backlight turns on), but the cursor does not move
- Physical clicks on the touchpad stop working
- Tap-to-click (сенсорный клик) still works
- Only a full system reboot restores functionality

What I've observed:
- `libinput debug-events` shows NO events when moving finger on dead touchpad
- Device is still visible in `libinput list-devices` with correct capabilities
- This is a regression — did not happen on previous Ubuntu versions (24.10, 24.04)

Hardware:
- Laptop: KVADRA NAU LE14U
- Touchpad: SYNA3602:00 093A:0255 (I2C HID v1.00)
- Kernel: 6.17.0-8-generic
- Ubuntu: 25.10

Steps to reproduce:
1. Boot Ubuntu 25.10 with kernel 6.17.0-8-generic
2. Do not touch the touchpad for 5-10 minutes
3. Try to move the cursor — it does not respond
4. Only reboot fixes the issue temporarily

Expected behavior:
Touchpad should remain functional after periods of inactivity.

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/2142386

Title:
Touchpad SYNA3602:00 stops responding to movement after 5-10 minutes
of inactivity (kernel 6.17.0-8-generic)

Status in linux package in Ubuntu:
New

Bug description:
After upgrading to Ubuntu 25.10 with kernel 6.17.0-8-generic, the
built-in touchpad (SYNA3602:00 093A:0255) stops responding to movement
after about 5-10 minutes of inactivity.

Symptoms:
- Touching the pad wakes up the screen (backlight turns on), but the cursor does not move
- Physical clicks on the touchpad stop working
- Tap-to-click (сенсорный клик) still works
- Only a full system reboot restores functionality

What I've observed:
- `libinput debug-events` shows NO events when moving finger on dead touchpad
- Device is still visible in `libinput list-devices` with correct capabilities
- This is a regression — did not happen on previous Ubuntu versions (24.10, 24.04)

Hardware:
- Laptop: KVADRA NAU LE14U
- Touchpad: SYNA3602:00 093A:0255 (I2C HID v1.00)
- Kernel: 6.17.0-8-generic
- Ubuntu: 25.10

Steps to reproduce:
1. Boot Ubuntu 25.10 with kernel 6.17.0-8-generic
2. Do not touch the touchpad for 5-10 minutes
3. Try to move the cursor — it does not respond
4. Only reboot fixes the issue temporarily

Expected behavior:
Touchpad should remain functional after periods of inactivity.

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