How is monitor brightness is controlled ?

[Quentin Schwerkolt]

The sysctl key for brightness run under X? I have never succeeded to
increase or decrease the screen brightness under X. I must use a tty for
perform it.

Cordially.
Q. Schwerkolt

On 05/15/12 11:37, Lawrence Stewart wrote:
> On 05/13/12 17:55, Yevgen Krapiva wrote:
>> Hi everyone.
>>
>> Could somebody tell me what thing in FreeBSD is managing the monitor
>> brightess ?
> 
> Given that the function keys don't work, check if you have any relevant
> sysctl options to play with. Most likely to find them under hw.acpi, but
> try grepping "sysctl -a" output for bright or lcd to see if anything
> comes up.
> 
>> I've got Dell Inspiron laptop, FreeBSD 9.0 RELEASE and KDE4.
>> Pressing the functional combintation of Fn+F4/F5 does not have any
>> effect.
>> In order to understand what's wrong I need to know in what direction I
>> should move.
> 
> Getting the fn keys working requires some ACPI voodoo I'm not familiar
> with, so I'll have to defer to someone else to advise on that. The info
> at [1] might be a good starting point. The fn keys on my Toshiba R600
> laptop started working only after I loaded the acpi_toshiba.ko kernel
> module. I note there's no similar module for Dell's so getting them
> working will probably require some fiddling.
> 
> Cheers,
> Lawrence
> 
> [1]
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html
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