RE: input/i8042: Malfunctioning brightness keys on HP Elite Dragonfly G2

[Lopez, Jorge A (Security)]

Hi Alex,

Let me investigate this issue.  The driver maps some keys, so it is possible the list is incomplete.  
It is expected hp_wmi driver to be loaded, Correct?
Can you provide the BIOS version current in your system?


Regards,

Jorge Lopez
Hewlett-Packard 

“Once you stop learning, you start dying”
Albert Einstein

-----Original Message-----
From: Hans de Goede <hdegoede@xxxxxxxxxx> 
Sent: Monday, July 11, 2022 7:10 AM
To: Alex Dewar <alex.dewar@xxxxxxxxx>; dmitry.torokhov@xxxxxxxxx; tiwai@xxxxxxx; markgross@xxxxxxxxxx; Lopez, Jorge A (Security) <jorge.lopez2@xxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; platform-driver-x86@xxxxxxxxxxxxxxx
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