Re: [PATCH] i2c: acpi: Add ELAN0678 to i2c_acpi_force_100khz_device_ids

[Mika Westerberg]

On Sat, Apr 18, 2026 at 07:37:19AM +0200, Niels Franke wrote:
> 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@xxxxxxxxx>

Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>