[Bug 213579] Clevo NH55HJ (intel tigerlake) touchpad support (GPIO can't be used as IRQ)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=213579

--- Comment #45 from wse@tuxedocomputers.com ---
(In reply to wse from comment #44)
> Found the offending code bit in the dsdt:
> 
>     Scope (_SB.PC00.I2C0)
>     {
>         Device (TPAD)
>         {
>             [...]
>             Method (_INI, 0, NotSerialized)  // _INI: Initialize
>             {
>                 BADR = SADR /* \_SB_.PC00.I2C0.TPAD.SADR */
>                 INTA = GNUM (0x0801000C)
>             }
>             [...]
>         }
>     }
> 
> INTA should evaluate to 0x8C (140), but does evaluate to 0x2c (44).
> GNUM is some kind of offset calculation, ignoring the 0x08, taking values
> from an array based on the 0x01 and adding it to the 0x000C. You can check
> it in the disassembled dsdt. I don't know ofcourse if GNUM is buggy, the
> array is wrong, or the 0x0801000C input value is wrong (you can choose an
> input value that makes GNUM evaluate to 0x8C).

However: Building and using a dsdt with INTA hardcoded to 0x8C makes the
touchpad work on arbitrary kernels. Maybe a better workaround then a self
compiled kernel.

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