Re: Touchpad stickiness on AMD laptops (was Dell Inspiron/XPS)

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Hi,

On 1/12/22 09:33, Wolfram Sang wrote:
> Hi Mario,
> 
> thanks for joining the discussion!
> 
>> 1) Systems returning SMBUS address 0xff
>>
>> The address can be potentially be returned using port I/O or it can be done
>> using MMIO.
>>
>> There is already a thread in process to add support for MMIO, but last I
>> heard it's waiting for review comments.
>>
>> https://lore.kernel.org/all/20210715221828.244536-1-Terry.Bowman@xxxxxxx/
> 
> This thread is under active discussion again.
> 
>> Now something else interesting - the SMBUS controller in these laptops often
>> is listed in the ACPI tables on IRQ7 with a _HID of SMB0001.
> 
> IIRC tests done by Miroslav showed that interrupt 7 was used for
> completing SMBus Block transfers and alike, but not for HostNotify. He
> suspects this is wired via GPIO somehow.

I expect host-notify to use IRQ7 too, but that it first needs to be
enabled by poking some registers in the SMBUS controller.

Regards,

Hans




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