From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?B?TWljaGHFgiBLxJlwaWXFhA==?= <kernel@kempniu.pl>
Subject: Re: Dell Vostro V131 hotkeys revisited
Date: Mon, 31 Aug 2015 11:51:07 +0200
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To: Mario Limonciello <mario_limonciello@dell.com>
Cc: Pali =?utf-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>, "Gowda, Srinivas G" <Srinivas_G_Gowda@dell.com>, "Brown, Michael E" <Michael_E_Brown@dell.com>, "Warzecha, Douglas" <Douglas_Warzecha@dell.com>, Matthew Garrett <mjg@redhat.com>, "Kabir, Rezwanul" <Rezwanul_Kabir@dell.com>, Alex Hung <alex.hung@canonical.com>, Darren Hart <dvhart@infradead.org>, "platform-driver-x86@vger.kernel.org" <platform-driver-x86@vger.kernel.org>

> > > Now as for actually simulating a keypress, it can be programmed u=
sing
> > > the following calling interface (on receiving the e025 WMI notifi=
cation).
> > > To actually simulate the keypress:
> > > Arg1=3D0x41
> > > Arg2 Byte [1:0]: Scan code to simulate
> > > Byte [3:2]
> > > * Bit0 - L Alt
> > > * Bit1 - R Alt
> > > * Bit2 - L Ctrl
> > > * Bit3 - R Ctrl
> > > * Bit4 - L Shift
> > > * Bit5 - R shift
> > > * Bit6 - L Win
> > > * Bit7 - R Win
> > > * Bit8 - Fn key
> >=20
> > And is it possible to disable keypress simulation on systems that h=
ave
> > that capability?
> >=20
> > My understanding is that all hardware equipped with an Instant Laun=
ch
> > button is capable of generating a WMI event upon its press, but not=
 all
> > models can generate a keypress at the same time, correct? If that's=
 the
> > case, then the arguably cleanest solution would be to change the ke=
ymap
> > entry for event 0xe025 in dell-wmi.c to KE_KEY and ensure (probably=
 in
> > dell-laptop.c) no i8042 interrupt is raised when the Instant Launch
> > button is pressed. Though that would still leave us with the questi=
on of
> > how to determine (ideally without side effects) whether a given mod=
el
> > needs disabling keypress simulation. I imagine the pseudocode would=
 be
> > like:
> >=20
> >     if (ec_can_simulate_keypresses)
> >         disable_keypress_simulation();
> >     else
> >         enable_wmi_event_generation();
> >=20
> > If disabling keypress simulation is not possible, dell-wmi.c has to
> > somehow determine whether a 0xe025 WMI event should be ignored or n=
ot.
> >=20
> > Am I making any sense here?

As the holiday season is coming to an end, I'm taking my last shot at
reviving this thread. Could anyone please tell us:

  * Is there a way to determine whether the EC is capable of simulating
    keypresses without the side effects that the SMBIOS call 4, 11 with
    argument 64 causes on certain hardware (e.g. disabling keyboard
    backlight on an E6440)? Or is there perhaps a well-defined list of
    machines that SMBIOS call is (un)safe on?

  * Is it possible to disable keypress simulation on machines on which
    the EC supports it? If so, how would one do that?

Thanks!

--=20
Best regards,
Micha=C5=82 K=C4=99pie=C5=84