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

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Message-ID: <20141203131254.GB20212@khazad-dum.debian.net>
Date:	Wed, 3 Dec 2014 11:12:54 -0200
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Pavel Machek <pavel@....cz>, linux-input@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Side effect of pressing special keys

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.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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