Re: [PATCH] i2c: acpi: Add VEN_04F3 to i2c_acpi_force_100khz_device_ids

[Andy Shevchenko]

On Tue, May 19, 2026 at 12:05:29PM +0200, Mika Westerberg wrote:
> On Tue, May 19, 2026 at 01:24:24AM -0400, Jacob Bazata wrote:
> > This model trackpad (04F3:32AA), found on various Dell XPS models
> > from 2023 including XPS 9500, 9510, 9520 and 9530 is well documented to,
> > at random, exhibit excessive smoothing with no obvious cause, similar
> > to other trackpad devices listed in the i2c_acpi_force_100khz_device
> > _ids struct.
> > 
> > Forcing the bus to 100KHz eliminates this behavior.

...

> > +	{ "VEN_04F3", 0 },
> 
> This is interesting ACPI ID. Adding Andy just in case he has any comments
> on it.

Yes, it's simply bogus and not following the ACPI specification [0]. We might
add the bogus IDs, but that has to be justified in the commit message:

- Is the device available on a wild market?
- If no, drop the patch, fix the firmware (I'm here to help with ACPI process bits)
- If yes, provide the Device name, model, year, et cetera to unique distinguish it,
  provide an excerpt from DSDT to show how this device is described there
- Also browse the MS catalog [1], duckduckgo, google for the ID to see if it
appears in some respectful sources
- Additionally, try to submit a bug report to the vendor of the device to point
out that this is bogus ID and must be fixed  (in a new BIOSes)

The more information you find and provide the better. (But distinguish the
important from secondary info,)

[0]: https://uefi.org/specs/ACPI/6.6/06_Device_Configuration.html#hid-hardware-id
[1]: https://www.catalog.update.microsoft.com/Search.aspx?q=ven_04f3

-- 
With Best Regards,
Andy Shevchenko