On Po 06-03-06 09:00:27, Antonino A. Daplas wrote:
> Richard Purdie wrote:
> > At present, the backlight class presents two attributes to sysfs,
> > brightness and power. I'm a little confused as to whether these
> > attributes are currently doing the right things.
> >
> > Taking brightness, at any one time we have several different brightness
> > values:
> >
> > * User requested brightness (echo y > /sys/class/backlight/xxx/brightness)
> > * Driver determined brightness which accounts for things like FB
> > blanking, low battery backlight limiting (an example from corgi_bl),
> > user requested power state, device suspend/resume.
> >
> > The solution might be to have brightness always return the user
> > requested value y and have a new attribute returning the brightness as
> > determined by the driver once it accounts for all the factors it needs
> > to consider. Naming of such an attribute is tricky - "driver_brightness"
> > perthaps?
>
> Why not just agree on a normal range of values (ie, 0-255), and let the
> driver "denormalize" them? Thus, a driver that has only 2 levels of
> brightness, will treat 0-127 as 0 and 128-255 as 1, and will return only
> two possible values 0 and 255.
Does not work... how do you set minimum brightness with backlight on
(so that text is visible)?
Pavel
--
Web maintainer for suspend.sf.net (www.sf.net/projects/suspend) wanted...
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
