On Tue, 2004-12-07 at 10:08 +0100, Michael Schmitz wrote: > fact, even the earlier Powerbooks work with 16 levels only these days - > the 32 level stuff must have been way back when the G3 Powerbooks were new > :-) > The backlight level 'register' would permit 255 levels (which ones are > safe to use is a matter of some confusion, though). The 16 levels are just > a matter of convenience to keep the backlight_conv[] tables short. I'm > sure these tables could be replaced by 32 level tables, or we could do > without any tables (they look like simple linear relations to me). The > only benefit I can see is to allow a more fine-grained control to > applications - for the good old backlight buttons, 15 levels seems enough. > I'll change the manpage accordingly.
Ideally, somebody would dive into Darwin AppleDisplay extension and extract the various values used to do the linear conversion for every panel model :) > Re: backlight control: could you please read back the current backlight > from the kernel before setting a new level upon brightness button events? > The sudden jump in intensity (after some script modified the backlight > level) is somewhat surprising otherwise. > > Michael > > -- Benjamin Herrenschmidt <[EMAIL PROTECTED]>
