Fixing the kernels backlight API (original) (raw)

Hans de Goede hdegoede at redhat.com
Fri Feb 14 00:45:46 PST 2014

Hi,

On 02/13/2014 09:12 PM, Matthew Garrett wrote:

On Thu, Feb 13, 2014 at 08:43:10PM +0100, Hans de Goede wrote:

I can understand where Dave is coming from, from a kernel pov, so this might really be easier to just solve in userspace. I don't know if you've seen my very rough sketch of how this could work in userspace in my other mail. The idea would be to still make this show up on a specific connector, but only at the xrandr level, not at the drm level, and have the xserver talk to some kind of backlightd for this. The backlightd API should of cource be generic enough that it can be used in wayland too. Sure. You should probably take a look at libbacklight, which already has some amount of support for appropriate heuristics.

Ah, I did not know about libbacklight, thanks for the pointer.

Note that although I believe we do need to sort out this mess, and having something like backlightd would be a good idea, I likely won't have time to work on this in the near future. For $dayjob I will be focussing on finishing rootless xorg and working on libinput. And $hobbytime is all going to getting upstream support for Allwinner ARM SoCs into place.

Still I'll put a line about this in my todo file, just don't expect anything soon, and no promises about this at all!

Regards,

Hans

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