Hi Jonathan,

On 10/14/23 23:16, Jonathan Dieter wrote:

On Sat, 2023-10-14 at 22:30 +0200, Hans de Goede wrote:

<snip>

Hans,

Thank you so much!  Adding a DSDT overlay worked perfectly!  The
touchpad is functioning exactly as you would expect (using the
i2c_hid_acpi driver).

That is good to hear, so that confirms that this line:

         If ((^^^PCI0.LPC0.H_EC.ECRD (RefOf (^^^PCI0.LPC0.H_EC.TPTY)) == 0x01))

In the DSDT is not functioning as it should under Linux.

<snip ls -l /sys/bus/i2c/devices/ which looks good now>

Is there some way we can get a fix in the kernel for this buggy ACPI table or should I be asking Lenovo for a fix?

I assume (and it seems so) that the:

         If ((^^^PCI0.LPC0.H_EC.ECRD (RefOf (^^^PCI0.LPC0.H_EC.TPTY)) == 0x01))

line in the DSDT does work under Windows. So now we need to figure out
why it does work under Windows and not under Linux.

Can you please run:

sudo acpidump -o acpidump.txt

And then reply to this email with the generated acpidump.txt attached ?
Note please drop the linux-input list from the Cc when sending the acpidump.

Then I'll take a look at the full DSDT and we'll see from there.

As for getting a BIOS fix for this, I think that the chances of Lenovo fixing this when asked are not good.

Regards,

Hans