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i2c: acpi: Force ELAN1300 touchpads to 100 kHz

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The ELAN1300 touchpad with HID ID 04F3:3104 on the ASUS VivoBook
X513UA_KM513UA exhibits severe pointer jumps and erratic movement when
the I2C bus operates at 400 kHz.

The system DSDT describes the touchpad using an I2cSerialBusV2 resource
with a speed of 0x00061A80, corresponding to 400 kHz, on the
AMDI0010:03 controller.

At this speed, libinput repeatedly reports:

kernel bug: Touch jump detected and discarded

Add ELAN1300 to i2c_acpi_force_100khz_device_ids so that it operates at
100 kHz.

Before the change, nine touch-jump events were recorded, with additional
messages suppressed by libinput's rate limiter. With the bus forced to
100 kHz, no touch-jump events have been observed and the touchpad operates
normally.

The affected system uses BIOS X513UA.319 dated 2023-05-09.

Signed-off-by: Abhijeeth Babu <babu.jeeth@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260617192611.125513-1-babu.jeeth@gmail.com
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Abhijeeth Babu 2026-06-18 00:56:11 +05:30 • committed by Andi Shyti
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