From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Niels Franke <nielsfranke@gmail.com>
Cc: westeri@kernel.org, wsa+renesas@sang-engineering.com,
linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i2c: acpi: Add ELAN0678 to i2c_acpi_force_100khz_device_ids
Date: Mon, 20 Apr 2026 10:37:13 +0200 [thread overview]
Message-ID: <20260420083713.GA3598@black.igk.intel.com> (raw)
In-Reply-To: <20260418053719.15766-1-nielsfranke@gmail.com>
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@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
prev parent reply other threads:[~2026-04-20 8:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-18 5:37 [PATCH] i2c: acpi: Add ELAN0678 to i2c_acpi_force_100khz_device_ids Niels Franke
2026-04-20 8:37 ` Mika Westerberg [this message]
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