linux-kernel - Re: Dell Vostro 3360 multimedia keys

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Message-ID: <9065116.JHLBT2mDoC@natalenko.name>
Date:   Mon, 27 Nov 2017 19:32:20 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Mario.Limonciello@...l.com
Cc:     pali.rohar@...il.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org, mjg59@...f.ucam.org,
        dvhart@...radead.org, andy@...radead.org, dmitry.torokhov@...il.com
Subject: Re: Dell Vostro 3360 multimedia keys

Hello.

On pondělí 27. listopadu 2017 17:56:07 CET Mario.Limonciello@...l.com wrote:
> > /* snip */
> > Looks like that Dell Vostro 3360 have this meaning for multimedia keys:
> > 
> > first key: Mobility Center
> > second key: Dell Support Center
> > third key: Dell Instant Launch Manager
> > 
> > (same as other Vostro laptops)
> 
> 
> As I can tell the "Instant Launch" key is supposed to be emitted
> both via WMI and scan code both.
> 
> Can you please check SMBIOS table 0xb1 offset 0x08?  This is the misc
> BIOS flags table.  It's been used for a few other drivers for other
> purposes
> too.  I expect that bit 1 should be set.  This should indicate
> that the system supports instant launch manager button.  You can use that
> to key off of for deviating behavior.

Is this correct:

[~]$ sudo dmidecode -t 0xb1        
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x003C, DMI type 177, 12 bytes
OEM-specific Type
        Header and Data:
                B1 0C 3C 00 1A 0E 00 00 01 00 00 00

?

> 
> As for why these two keys (first and second) seem to emit the same code,
> keep in mind that these were machines from around the era of Windows Vista.
> Microsoft had allowed applications to register tiles in the "mobility
> center". 
> Dell had an application at that time (Quickset) that would receive the WMI
> events and register tiles in the mobility center.  So the application could
> then
> know to open up mobility center applet when it needed to from WMI
> request or to launch another application if it needed to.
> 
> This has all obviously changed with newer versions of Windows.
> 
> I would recommend to have a separate function in dell-wmi driver for when 
> you see instant launch key in misc flags table and to allow looking at 
> extended buffer for these behaviors.
> 
> 
> > 
> > But do not know what KEY_* are used on other Vostro laptops for those
> > keys. It would be great to use same KEY_*...
> 
> 
> These first two aren't intended to be generally mapped (as I described
> above).
> I think for Linux you can map them if you desire by my above
> description. 
> /* snip */