Re: HP Zbook studio G5 Brightness and mic mute keys give same scancode

From: Hans de Goede <hdegoede@redhat.com>
To: Friso Smit <thestroyer@cock.li>,
	Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Platform Driver <platform-driver-x86@vger.kernel.org>,
	Mark Gross <mgross@linux.intel.com>
Subject: Re: HP Zbook studio G5 Brightness and mic mute keys give same scancode
Date: Tue, 24 Nov 2020 12:14:25 +0100	[thread overview]
Message-ID: <52f754d9-f4c4-9a5b-82b4-6d6878a94eec@redhat.com> (raw)
In-Reply-To: <1dbe090f-03c4-f003-6c38-c139c38313e2@cock.li>

Hi,

On 11/12/20 7:25 PM, Friso Smit wrote:
> Hi,
> 
> I'm not sure if you have read the previous mails in this thread, but the
> problem is solved, at least for me, with a bios update.

At that is good to know.

> I don't know how
> it works exactly, but all keys produce different scan codes now. Are there
> still some models where this is a problem?

Yes this is till a problem on at least the hp-pavilion-cx-0598na, see
the mail thread starting here:

https://lore.kernel.org/platform-driver-x86/CAGTBY+sgwYrDPtQgJV=TcXJ73n8TGf9Nw=arCfWMUrVFzAsEVQ@mail.gmail.com/

I've just asked the reported of that problem to check if there is a BIOS
update for his system.

Regards,

Hans

> On 11/9/20 2:44 PM, Hans de Goede wrote:
>> Hi,
>>
>> On 11/5/20 5:47 PM, Andy Shevchenko wrote:
>>> +Cc: subsystem maintainers
>>>
>>> On Sun, May 17, 2020 at 2:24 PM <thestroyer@cock.li> wrote:
>>>> Hi,
>>>> On my HP Zbook studio G5 a few keys on my keyboard give the same
>>>> scancodes. Most notably, the brightness and mute function keys all give
>>>> the scan code sequence 0xe0 0x20 0xe0 0xa0 as reported by showkey
>>>> --scancodes. It only produces a scancode when pressed, not when
>>>> released. I found another very similar issue in this mailing list found
>>>> in https://www.spinics.net/lists/platform-driver-x86/msg16791.html. The
>>>> issue in that mail was solved by a bios update. I'm running the latest
>>>> bios, but I still have the issue.
>>>> I tried the kernels: Manjaro 5.7rc4-1, Manjaro 5.6.11-1 and Manjaro
>>>> 5.4.39-1
>>>> I also tried a few other distributions, but they all have the same
>>>> issue.
>>>> I'm happy to provide more information about this issue if needed.
>> So this already came in another thread for another HP laptop model,
>> this seems to be a common issue on some (newer?) HP laptop models.
>>
>> It seems that we need to make some special WMI calls for this, either
>> to figure out which key is actually pressed when receiving the
>> PS/2 scancode which is shared between multiple keys. Or to get the
>> device to send different scancodes.
>>
>> This will require someone with some knowledge of ACPI/WMI as well
>> as of writing kernel code to get physical access to an affected HP
>> laptop to figure out what is going on and write some code to deal with
>> this special setup.
>>
>> Regards,
>>
>> Hans
>>