On Wed, May 18, 2022 at 02:59:58PM +0200, Hans de Goede wrote: > Hi, > > On 4/14/22 15:10, Jani Nikula wrote: > > There are some cases where we can actually get a rough PWM/luminance > > curve from i915 opregion. I think maybe 16 data points. We've never > > exposed that. My idea was that you'd have a property where you could add > > data points for the curve, it could get pre-populated by the kernel if > > the kernel knows how to do it, defaulting to linear, but it could also > > be set or adjusted by userspace. The point would be that the userspace > > adjusts brightness linearly, and the kernel would use the curve data > > points to adjust it non-linearly. The userspace could have completely > > separated brightness adjustment and curve adjustment, and the brightness > > adjustment would be dead simple. > > Interesting, I guess this could be a future feature addition on top > of my work. Here's an outdated branch: https://github.com/vsyrjala/linux/commits/blcm_backlight Wrote that some years ago after getting fed up with the useless non-linear respose of the brightness up/down buttons on my laptop. Been running it ever since. -- Ville Syrjälä Intel
