Re: [Mactel-linux-users] screen back light control on a Mac Book Pro 17"

[Nicolas B. <ni...@bo...>]

Armando Di Cianno wrote:
> On Fri, Jun 23, 2006 at 07:23:06PM +0200, Nicolas Boichat wrote:
>   
>> That's the old version (Windows-like)... I submitted a newer version
>> (OSX-like) on the list, if you don't want to dig into the archives,
>> someone copied the files here:
>> http://modular.math.washington.edu/macbook/backlight/
>>     
>>> I've had some *weird* issues with it.  When setting the backlight to 15
>>> (full) the MBP immediately powered off.  This happened twice.
>>>   
>>>       
>> It happens on Windows too...
>>     
>
> Is this related somehow to the regular way to change brightness, or just
> a general problem with Windows and Linux on the MBP's?  I ask because
> it's *only* happened when I used the original brightness changing
> program.
>   
I think there is a bug in the BIOS emulation (the registers used by the
first version of my program are only available if the system is booted
in this mode, while the second version use registers available on both
BIOS and EFI). I don't know why Apple did not provide a tool for Windows
that use the same registers as OS X, as it is technically feasible.