drm2 regression: backlight adjustment on ivybridge no longer works

[Lars Engels]

On Sat, Jan 31, 2015 at 07:11:23AM +0000, Miguel Clara wrote:
> On the laptop I'm running current, if relevant
> 
> Loading acpi_video doesn't do much....  I don't see any sysctl related to
> "lcd0" or "birightness", this is one of those computers with "hybrid"
> graphics, intel + ATI card, so not sure if that's somewhat related.
> 
> 
> Anyway, I've just tested the drm patches (both) and intelbacklight (
> https://github.com/grembo/intel_backlight_fbsd) compiles, installs and runs
> fine!
> 
> So thanks both for the patches.

On my X230 I also lost the ability to control brightness with Fn+F8 /
Fn+F9.
With acpi_video I get some interesting sysctl:
hw.acpi.video.lcd0.levels: 100 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
88 89 90 91 92 93 94 95 96 97 98 99 100

I guess it should not be 100 100 0 ... 100?

Changing brightness with hw.acpi.video.lcd0.brightness doesn't work.
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