On Sun, Feb 22, 2015 at 11:59 PM, Jani Nikula <jani.nikula@xxxxxxxxx> wrote: > > Hi Michael - > > Please always cc: the relevant mailing lists; done now. > > On Sun, 22 Feb 2015, Michael Leuchtenburg <michael@xxxxxxxxxxxxx> wrote: >> Hi Jani, >> >> I've been trying to figure out how to control the dynamic backlight control >> on my new Dell XPS 13 since the defaults are atrocious - huge swings in >> brightness from a black background to a white one, over a few seconds >> period so it's very obvious. I eventually tracked down a patch from the >> Chromium folks that adds a sysfs interface ( >> https://chromium.googlesource.com/chromiumos/third_party/kernel/+/db5eacd6ac7a0cbda4ea1010fabbd3ff6b30e0bc%5E%21/), >> but it seems to depend on your patch that adds eDP display control >> registers ( >> http://lists.freedesktop.org/archives/dri-devel/2013-November/049098.html), >> which was never merged into mainline as far as I can tell. >> >> Do you know what the status of that is? Is it still wending its way through >> the process (now, over a year later) or did it die somewhere along the way? >> The patch doesn't apply to mainline today, though it's simple enough that I >> suspect it'd be easy to adapt. I'd rather see where it went, though. >> >> I'd appreciate any help you can offer. > > The Chrome OS patches wouldn't be acceptable upstream, and indeed > they've never been posted upstream. A more driver agnostic approach > would be required. I actually asked Eric to make a property version of this: https://chromium-review.googlesource.com/#/c/244165/ Once this lands in Chrome OS, we should upstream it. Stéphane > > My patches were simple, adding some macros etc. They were reviewed but > apparently forgotten, also by me. I'll repost them, but they won't do > you much good in this case. > > I'm also not convinced yet that your problem would be solved by the > patches; are you sure Dell XPS 13 does have dynamic backlight control in > the panel, adjustable via DPCD? > > BR, > Jani. > > > -- > Jani Nikula, Intel Open Source Technology Center > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
