Re: [PATCH v2] i2c: acpi: Add DELL0A86 to i2c_acpi_force_100khz_device_ids

On Mon, Aug 24, 2026 at 12:22:21PM +0200, Mika Westerberg wrote:
> +Andy

We need to convert the ID table to use C99 initialisers and drop the unused
driver_data. It may be done either before or after this change.

> On Sun, Aug 23, 2026 at 08:33:10PM +0800, xiaoyueyoqwq wrote:
> > The ELAN 04F3:3185 touchpad exposed as DELL0A86 on the Dell Inspiron
> > 13 5310 intermittently exhibits excessive smoothing when the I2C bus
> > runs at 400 kHz. During an affected period pointer movement becomes
> > severely sluggish and sticky for tens of seconds.
> > 
> > The ACPI firmware configures the touchpad bus for 400 kHz. Add DELL0A86
> > to i2c_acpi_force_100khz_device_ids so that the bus runs at 100 kHz, as
> > is already done for other touchpads exhibiting the same excessive
> > smoothing problem.
> > 
> > With the quirk applied, the kernel reports that the firmware requested
> > 400 kHz and that the bus is forced to 100 kHz. The problem did not recur
> > during extended heavy use, including an S4 hibernate/resume cycle.

Is here any bug report somewhere publicly made?

> > Assisted-by: Codex:ChatGPT-5.6-Sol
> > Assisted-by: OpenCode:Ox Alpha (x-preview-f-free)
> > Signed-off-by: xiaoyueyoqwq <[email protected]>
> 
> You should use your full name here.
> 
> Anyway looks good to me.
> 
> Acked-by: Mika Westerberg <[email protected]>

Otherwise agree with Mika's judgement.

-- 
With Best Regards,
Andy Shevchenko