linux-kernel - Re: [PATCH v6 09/13] HID: i2c-hid: acpi: Stop setting wakeup

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Date:   Thu, 12 Jan 2023 14:09:54 -0600
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Werner Sembach <wse@...edocomputers.com>,
        Raul E Rangel <rrangel@...omium.org>,
        linux-acpi@...r.kernel.org, linux-input@...r.kernel.org
Cc:     andriy.shevchenko@...ux.intel.com, dmitry.torokhov@...il.com,
        hdegoede@...hat.com, rafael@...nel.org,
        mika.westerberg@...ux.intel.com, timvp@...gle.com,
        linus.walleij@...aro.org, jingle.wu@....com.tw,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Alistair Francis <alistair@...stair23.me>,
        Jiri Kosina <jikos@...nel.org>, Rob Herring <robh@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 09/13] HID: i2c-hid: acpi: Stop setting wakeup_capable

On 1/12/2023 13:57, Werner Sembach wrote:
> Hi,
> 
> Am 29.09.22 um 18:19 schrieb Raul E Rangel:
>> This is now handled by the i2c-core drive >
>> Signed-off-by: Raul E Rangel <rrangel@...omium.org>
>> Acked-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>> ---
>>
>> (no changes since v5)
>>
>> Changes in v5:
>> - Added Acked-by: Benjamin Tissoires
>>
>>   drivers/hid/i2c-hid/i2c-hid-acpi.c | 5 -----
>>   1 file changed, 5 deletions(-)
>>
>> diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.c 
>> b/drivers/hid/i2c-hid/i2c-hid-acpi.c
>> index b96ae15e0ad917e..375c77c3db74d92 100644
>> --- a/drivers/hid/i2c-hid/i2c-hid-acpi.c
>> +++ b/drivers/hid/i2c-hid/i2c-hid-acpi.c
>> @@ -105,11 +105,6 @@ static int i2c_hid_acpi_probe(struct i2c_client 
>> *client)
>>       acpi_device_fix_up_power(adev);
>> -    if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
>> -        device_set_wakeup_capable(dev, true);
>> -        device_set_wakeup_enable(dev, false);
>> -    }
>> -
>>       return i2c_hid_core_probe(client, &ihid_acpi->ops,
>>                     hid_descriptor_address, 0);
>>   }
> 
> this patch is causing a regression on the Clevo NL50RU of which the 
> touchpad instantly wakes up the device when going to sleep. That wasn't 
> triggered until this patch by the default settings: Setting wake capable 
> but not enabling it by default. So unless a user enabled it by hand, the 
> device went correctly to sleep.
> 
> I'm not deep into this subsystem so I don't know what the best approach 
> is to ?work around this firmware bug?/?fix this issue?:
> - Changing the default back again?
> - Adding a quirk list for bad devices?
> - Maybe this isn't a firmware bug, but the touchpad was not meant to 
> wakeup the device and we can somehow detect that?
> 

"Generally" laptops that support modern standby/s2idle can be woken from 
the touchpad.

By chance can you check Windows?  Wait a few minutes after you put it to
sleep to ensure it's really gotten down to a hardware sleep state.

> For reference: The debugging issue that lead me here: 
> https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1719789

TLDR - That bug has multiple conflated issues, and you can ignore 95% of 
it.  It's just the last few comments we concluded and bisected down this 
regression.