From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Abhijeeth Babu <babu.jeeth@gmail.com>
Cc: Mika Westerberg <westeri@kernel.org>,
Andi Shyti <andi.shyti@kernel.org>,
linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i2c: acpi: Force ELAN1300 touchpads to 100 kHz
Date: Thu, 18 Jun 2026 08:09:16 +0200 [thread overview]
Message-ID: <20260618060916.GI2990@black.igk.intel.com> (raw)
In-Reply-To: <20260617192611.125513-1-babu.jeeth@gmail.com>
On Thu, Jun 18, 2026 at 12:56:11AM +0530, Abhijeeth Babu wrote:
> 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>
prev parent reply other threads:[~2026-06-18 6:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-17 19:26 [PATCH] i2c: acpi: Force ELAN1300 touchpads to 100 kHz Abhijeeth Babu
2026-06-18 6:09 ` Mika Westerberg [this message]
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