On Tue, Apr 27, 2004 at 08:34:32AM +1000, Benjamin Herrenschmidt wrote: > On Mon, 2004-04-26 at 23:35, Guido Guenther wrote: > > Hi, > > I'm attaching a qick hack that I'm using to control the display > > brightness on my NV17 based pbook. Simply pass the brightness (1-15) as > > argument on the comman line. This is quiet usefull when using offb since > > adjusting the brighness only works with rivafb. Uuhhh I _should_ use a spell checker from time to time... > Interesting. Does adjusting the brightness works at all with rivafb ? > I though it only did full on vs full off ? I posted a patch for this a while ago. > One thing... The formula you are using to calculate the value written, > ideally, you should try to understand the OF forth code setting the > brightness and reproduce the precise formula used there. It uses > some values in the device-tree as parameters for example. I wonder > if we risk damaging the backlight circuit by writing incorrect values > there ... Well, I simply didn't get around to do it yet. I'm using the patch for several months now, so incorrect values don't seem to cause any harm. If you choose values between 1 and 15 the values will always be _lower_ than the ones set by MacOS X. Cheers, -- Guido
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