Re: Dell Vostro 3360 multimedia keys

Pali Rohár
2018-01-27T14:06:03Z

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On Tuesday 21 November 2017 19:58:24 Oleksandr Natalenko wrote:
> Hi.
>
> On úterý 21. listopadu 2017 19:36:24 CET Pali Rohár wrote:
> > Ok, if wmi_requires_smbios_request is really doing nothing, then it
> > should not be used. It enables some QSET feature in Dell SMM mode which
> > is for 2 laptops.
>
> It is also used to filter 0xe025 key code which is generated by 3rd key and is
> visible via both atkbd and wmi:
>
> ===
> 343 if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
> 344 return;
> ===
>
> (see commit 13f5059ac5a6b)

Yes, this filtering is enabled and needed only when QSET feature was
activated. And is needed only for machines which need QSET feature.

> > 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)
>
> Likely, yes. At least, for Launch Manager (key "3") there is a record in the
> table:
>
> ===
> 135 /* Dell Instant Launch key */
> 136 { KE_KEY, 0xe025, { KEY_PROG4 } },
> ===
>
> As for Mobility Center, relevant key is commented out and has completely
> different keycode:
>
> ===
> 150 /* Untested, Windows Mobility Center button on Inspiron 7520 */
> 151 /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */
> ===
>
> For Support Center, it is not commented, but still reserved:
>
> ===
> 189 /* Dell Support Center key */
> 190 { KE_IGNORE, 0xe06e, { KEY_RESERVED } },
> ===

In both cases important is KE_IGNORE, which fully drops those events. So
IIRC we used KEY_RESERVED as it is irrelevant which key code is defined for
dropped events.

> > But do not know what KEY_* are used on other Vostro laptops for those
> > keys. It would be great to use same KEY_*...
>
> So, according to what I see above, it looks like KEY_PROG(X) pattern should be
> followed.
>
> > > Well, I've tried. The problem is that if I even configure this key
> > > via setkeycodes, it doesn't work.
> >
> > Hm... why it does not work?
> >
> > CCing Dmitry, can you tell us what needs to be done to "active" key from
> > AT Keyboard driver which prints following messages to dmesg?
>
> Just to note what I did. Here is my custom /etc/udev/hwdb.d/90-dell-
> vostro-3360.hwdb:
>
> ===
> evdev:atkbd:dmi:bvnDellInc.:bvrA18:bd09/25/2013:svnDellInc.:pnVostro3360:pvr:rvnDellInc.:rn0F5DWF:rvrA00:cvnDellInc.:ct8:cvr0.1:
> KEYBOARD_KEY_60=prog4
> ===
>
> Here is how this key press is being detected by evtest via atkbd:
>
> ===
> Event: time 1511289883.083968, type 4 (EV_MSC), code 4 (MSC_SCAN), value 60
> Event: time 1511289883.083968, type 1 (EV_KEY), code 203 (KEY_PROG4), value 2
> Event: time 1511289883.083968, -------------- SYN_REPORT ------------
> ===

So, it is working fine and there is no problem in kernel.

> But xev shows nothing when I press this key. Am I doing something wrong?

This is bug in X Server or so. You would need to remap keycode to
something different as a workaround for X Server.

> > In dell-wmi we filter all key events which are also delivered via PS/2
> > AT Keyboard driver. So filtering PS/2 keys instead of WMI is anti-design
> > solution.
>
> Well, sounds reasonable...
>
> Thanks.
>
> Regards,
> Oleksandr

--
Pali Rohár
pali.rohar@gmail.com

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