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Nobuto Murata: How to prevent TrackPoint or touchpad events from waking up ThinkPad T14 Gen 5 AMD from suspend
- Frequent wakeups due to events touching the TrackPoint or the lid touch the red cap is a known problem with ThinkPad T14 Gen 3 AMD and T14 Gen 5 AMD.
- The touchpad device, ELAN0676:00 04F3:3195 Touchpad, can be found in the udev device tree and touchpad events as a wakeup source can easily be disabled.
- Disabling the TrackPoint device as a wakeup source can prove to be difficult since none of the parent devices including the ACPI Sleep Button stop it from waking up the system.
- The solution is in ignoring wakeup triggers from GPIO pin #0 with the kernel option with the help of amd_s2idle.py.
- The limitation is coming from firmware, and the models are few years old, so there is no hope of fixes from the manufacturer.
- However, the author in the end enabled the touchpad as a wakeup source to tap when the system is asleep.
- The issue of frequent wakeups from different events can cause battery Drain and heating up of the system in confined spaces.
- Disabling the wakeup events from the keyboard is a side effect of disabling touchpad events as a wakeup source.
- Gen 3 AMD is harder to solve, and in the end, the author had to enable the touchpad explicitly as a wakeup source, as it is less sensitive than the TrackPoint.
- The custom udev rule for disabling touchpad and TrackPoint events is applicable for T14 Gen 5 AMD.
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