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

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Message-ID: <c89d39eb-17b9-8800-c8ff-8d236b80de2f@redhat.com>
Date:   Mon, 11 Jul 2022 14:09:58 +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,
        "Lopez, Jorge A (Thin Clients)" <jorge.lopez2@...com>
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 Alex,

On 7/11/22 09:49, Alex Dewar wrote:
> Hi Hans,
> 
> On Sat, 2022-07-09 at 16:56 +0200, Hans de Goede wrote:
>> 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).
> 
> I tried this but unfortunately this doesn't seem to be the whole story.
> If I press "decrease brightness" I get:
> Event: time 1657525393.922727, -------------- SYN_REPORT ------------
> Event: time 1657525397.043348, type 4 (EV_MSC), code 4 (MSC_SCAN),
> value 81
> Event: time 1657525397.043348, type 1 (EV_KEY), code 190 (KEY_F20),
> value 1
> Event: time 1657525397.043348, -------------- SYN_REPORT ------------
> Event: time 1657525397.050384, type 4 (EV_MSC), code 4 (MSC_SCAN),
> value 81
> Event: time 1657525397.050384, type 1 (EV_KEY), code 190 (KEY_F20),
> value 0
> 
> And if I press "increase brightness" I get:
> Event: time 1657525397.050384, -------------- SYN_REPORT ------------
> Event: time 1657525398.607184, type 4 (EV_MSC), code 4 (MSC_SCAN),
> value 81
> Event: time 1657525398.607184, type 1 (EV_KEY), code 190 (KEY_F20),
> value 1
> Event: time 1657525398.607184, -------------- SYN_REPORT ------------
> Event: time 1657525398.614190, type 4 (EV_MSC), code 4 (MSC_SCAN),
> value 81
> Event: time 1657525398.614190, type 1 (EV_KEY), code 190 (KEY_F20),
> value 0
> 
> There's no difference! And I also get the same thing if I press the
> *actual* mute mic button 😞.
> 
> Any ideas?

>From this it looks like we need to use some other interface to get
these events (+ ignore the above events).

Do you have a "HP WMI hotkeys" device in your list of input
devices?  And are you getting any events on that ?

Likewise do you have a "Video Bus" device and any events on that ?

I've also added Jorge from HP to the Cc. Jorge, can you help with this ?

Regards,

Hans