On Fri 2019-06-28 08:55:16, Daniel Thompson wrote:
On Wed, Jun 26, 2019 at 04:56:18PM +0200, Pavel Machek wrote:
quoted
On Mon 2019-06-24 13:31:13, Matthias Kaehlcke wrote:
quoted
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