[Intel-gfx] New Samsung driver for backlight control.

[Greg KH]

On Wed, Aug 26, 2009 at 08:34:10AM +0100, Mike Lothian wrote:
> 2009/8/24 Matthew Garrett <mjg59 at srcf.ucam.org>:
> > On Sat, Aug 22, 2009 at 10:27:58AM +0100, Mike Lothian wrote:
> >
> >> Do you have any idea why my brightness buttons aren't working correctly?
> >
> > The previous code would have let you set the brightness to the entire
> > range supported by the GPU, which may be outside the specs of your
> > backlight. The new one limits it to the range that the hardware is
> > designed to use.
> >
> > --
> > Matthew Garrett | mjg59 at srcf.ucam.org
> >
> 
> If it's the BIOS that's telling the driver what's the limits are,
> we've already established my BIOS is garbage, perhaps this isn't the
> most reliable source of information
> 
> Now for the line I cringe at - under Vista 32bit (the only OS to
> control the backlight before your patches) has full control of the
> backlight from it's brightest setting to switched off
> 
> Being able to switch the backlight off through this control has a lot
> of power saving advantages

Yes, I need to figure out how to turn the light off "properly", am still
working on that.  Windows is _heavily_ patched by Samsung to use this
interface (you will notice a sabi.dll somewhere on that box that handles
all of this "magic").

Maybe someday Samsung will switch to using ACPI for this kind of thing,
which is the correct solution.

thanks,

greg k-h