On Fri 2019-06-28 08:55:16, Daniel Thompson wrote:
> On Wed, Jun 26, 2019 at 04:56:18PM +0200, Pavel Machek wrote:
> > On Mon 2019-06-24 13:31:13, Matthias Kaehlcke wrote:
> > > Check if a brightness curve specified in the device tree is linear or
> > > not and set the corresponding property accordingly. This makes the
> > > scale type available to userspace via the 'scale' sysfs attribute.
> > >
> > > To determine if a curve is linear it is compared to a interpolated linear
> > > curve between min and max brightness. The curve is considered linear if
> > > no value deviates more than +/-5% of ${brightness_range} from their
> > > interpolated value.
> >
> > I don't think this works. Some hardware does takes brightness in perceptual units,
> > converting it in the LED controller.
>
> This check is exclusive to PWM backlights so I'd like to double check
> that you are thinking specifically of hardware that takes it's signal
> from the PWM and works in perceptual units?
I missed that details. Taking PWM input then converting it to
perceptual units would indeed be strange.
Sorry,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Attachment:
signature.asc
Description: Digital signature
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
