Re: Side effect of pressing special keys

From: Gabriele Mazzotta
Date: Wed Dec 03 2014 - 08:38:23 EST

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.

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