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

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Message-Id: <201412031424.12142@pali>
Date:	Wed, 3 Dec 2014 14:24:11 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>
Cc:	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 14:12:54 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?

-- 
Pali Rohár
pali.rohar@...il.com

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