# Re: Side effect of pressing special keys

- From: Pali Rohár \<hidden\>
- Date: 2014-12-03 12:46:19 
- List: linux-input
- Page: https://ratatoskr.run/linux-input/2014/12/4387917
- Thread: https://ratatoskr.run/linux-input/2014/11/4380420/t.md

```text
On Wednesday 03 December 2014 13:40:42 Pavel Machek wrote:
> On Sun 2014-11-23 14:41:17, Pali Rohár wrote:
> > Hello,
> > 
> > pressing some keys on laptops could cause some side effects.
> > 
> > Example scenario 1:
> > 
> > Laptop has Fn key for enabling/disabling WIFI and when that
> > key is pressed BIOS is doing two things:
> > 
> > 1) Switch hard rfkill state of WIFI
> > 2) Report that Fn key was pressed to kernel
> > 
> >    (either via i8042 bus or via ACPI/WMI)
> 
> We should not really report that as a "key" to userspace. We
> might want to report that rfkill state changed....
> 							Pavel

Ok, and what about KEY_KBDILLUMTOGGLE when bios also handle 
keyboard backlight level? Should be this key filtered too?

-- 
Pali Rohár
pali.rohar@gmail.com
```

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