]> git.ipfire.org Git - thirdparty/kernel/linux.git/commit
i2c: acpi: Add ELAN0678 to i2c_acpi_force_100khz_device_ids
authorNiels Franke <nielsfranke@gmail.com>
Sat, 18 Apr 2026 05:37:19 +0000 (07:37 +0200)
committerWolfram Sang <wsa+renesas@sang-engineering.com>
Mon, 4 May 2026 09:17:46 +0000 (11:17 +0200)
commit9998e388be9930c106eb5904c23ecf2162407527
treeed0444d63f1ff509de7bd0c0d93406a1e1abf662
parentc5f25f5800f56f1754d9eeb3ced7c1e08c29119a
i2c: acpi: Add ELAN0678 to i2c_acpi_force_100khz_device_ids

The ELAN0678 touchpad (04F3:3195) found in the Lenovo ThinkPad X13
exhibits excessive smoothing when the I2C bus runs at 400KHz, making
the touchpad feel sluggish when plugged into AC power. This is the
same issue previously fixed for ELAN06FA.

The device's ACPI table (Lenovo TP-R22) specifies 0x00061A80 (400KHz)
for the I2cSerialBusV2 descriptor. Forcing the bus to 100KHz eliminates
the sluggish behavior.

Signed-off-by: Niels Franke <nielsfranke@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[wsa: kept the sorting]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
drivers/i2c/i2c-core-acpi.c