https://bugzilla.kernel.org/show_bug.cgi?id=25482





--- Comment #10 from Michal Zatloukal <[email protected]>  2010-12-28 
13:46:04 ---
(In reply to comment #9)
> > Second, the /sys/module/video/parameters/brightness_switch_enabled is set 
> > to Y
> > in current Ubuntu kernel. Setting it to N fixes pretty much everything -
> > hotkeys increment and decrement properly, powerdevil detects the keypresses 
> > and
> > shows the brightness level as it's increased/decreased correctly, showkey -s
> > detects 4 characters on quick keypress for both keys, and brightness is
> > adjusted in tty as well as in X.
> > 
> so it seems that everything works well if brightness_switch_enabled=N, right?

Correct. Is this normal and the laptop simply needs to be put into some
white-/black-list to work OotB or is this a bug and the correct behavior 
should not depend on the switch_enabled parameter?

> But I'm wondering why it affects the input event generated.

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