linux-kernel - Re: input/i8042: Malfunctioning brightness keys on HP Elite Dragonfly G2

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Message-ID: <8b893c42-e514-bcef-0513-070b3723cdcc@redhat.com>
Date:   Sat, 9 Jul 2022 16:56:15 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Alex Dewar <alex.dewar@....co.uk>, dmitry.torokhov@...il.com,
        tiwai@...e.de, markgross@...nel.org
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: input/i8042: Malfunctioning brightness keys on HP Elite Dragonfly
 G2

Hi,

On 7/5/22 19:25, Alex Dewar wrote:
> Friendly ping? 🙂
> 
> I'm also CC'ing the x86 platform people into this, as I'm not sure
> whether this problem is something more within their remit.

Please test the atbkd device with "sudo evemu-record" or "sudo evtest"
and if the brightness keys generate events there, write down the
raw event codes (MSC events).

Assuming the brightness keys indeed send events here, then:

After that you need to create an update to:
/lib/udev/hwdb.d/60-keyboard.hwdb to fix the mapping for your laptop.
See the "To update this file, create a new file ..." section.

You can find the DMI match pattern used in this file by doing:

cat /sys/class/dmi/id/modalias

Once you have things working, please submit a pull-req to upstream
systemd to get these quirk included in the offical hwdb. Or send
me a copy of the local 70-keyboard.hwdb override you have created
and I can submit it upstream for you.

Regards,

Hans

> 
> Best,
> Alex
> 
> On Wed, 2022-06-29 at 10:43 +0100, Alex Dewar wrote:
>> Hi,
>>
>> I'm running Linux 5.18.7 on an HP Elite Dragonfly G2 laptop, which
>> seems
>> to use the i8042 driver. Mostly things seem to work (including
>> hotkeys)
>> except that the increase/decrease brightness keys instead send the
>> "mic
>> mute" keycode. (The *actual* mic mute key works fine.)
>>
>> Any ideas? Do we need to add a quirk?
>>
>> Best,
>> Alex
>