Re: Unsupported brightness interface on X1 Carbon (1st gen)

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On Mon, 14 Apr 2014, Tyler Brock wrote:
> Is this true of the first generation X1C? I realize the 2nd gen just came
> out and don't expect that to be fully supported yet but the original has
> been around for years now.

Sort of.  The 2nd gen has more rough corners, but lots of stuff in the x1c
1st gen need specific support as well.

> I've done some poking around and compiled a module with some debugging. I
> found that my 1st gen X1C is reporting that it has a 100 level brightness
> interface (which is why we are getting this message).

ACPI video is utterly useless for Win8 boxes, that includes the X1C 1st gen.

> Maybe you can give me some guidance so I can work on and submit a patch to
> handle supporting this? It is somewhat odd considering the brightness
> controls seem to work for me regardless of the interface being unsupported
> but I'd like to give it a shot.

It is mostly cosmetic, really.  thinkpad-acpi cannot do much as far as
brightness goes on thinkpads where the gpu itself controls the backlight.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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