linux-kernel - Re: Side effect of pressing special keys

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Message-Id: <201412031440.50755@pali>
Date:	Wed, 3 Dec 2014 14:40:50 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Gabriele Mazzotta <gabriele.mzt@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Pavel Machek <pavel@....cz>, linux-input@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Side effect of pressing special keys

On Wednesday 03 December 2014 14:38:15 Gabriele Mazzotta wrote:
> On Wednesday 03 December 2014 14:24:11 Pali Rohár wrote:
> > On Wednesday 03 December 2014 14:12:54 Henrique de Moraes
> > 
> > Holschuh wrote:
> > > On Wed, 03 Dec 2014, Pali Rohár wrote:
> > > > Ok, and what about KEY_KBDILLUMTOGGLE when bios also
> > > > handle keyboard backlight level? Should be this key
> > > > filtered too?
> > > 
> > > IME, heck yes.
> > > 
> > > If you ever make the mistake of sending to userspace
> > > something the BIOS/kernel already reacted to, they will
> > > find a way to loop it back to you and cause all sort of
> > > issues.
> > 
> > Ok, I think same. In KDE4 I see some loop/noop operation
> > when new dell keyboard backlight driver is used. Key
> > KEY_KBDILLUMTOGGLE cause that BIOS change brightness and
> > also KDE4 see it and change it too...
> > 
> > Similar problem there is with KEY_WLAN and NetworkManager.
> > 
> > Gabriele, can you create patch which disable both KEY_WLAN
> > and KEY_KBDILLUMTOGGLE in dell-wmi.c driver?
> 
> KEY_KBDILLUMTOGGLE is actually disabled already, but KEY_WLAN
> (which I guess it should changed to KEY_RFKILL now that it
> exists) isn't, so I will submit a patch. The comment above it
> in dell-wmi.c makes me think that for all the systems the
> BIOS does everything and not only mine.
> 
> Gabriele

KEY_KBDILLUMTOGGLE is not disabled for sure. I see it in log from 
input-events program.

-- 
Pali Rohár
pali.rohar@...il.com

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