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lenovo b570 brightness control doesn't go to low brightness

b570 brightness

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Hi guys, on MacOSX with DSDT patched by macinsane B570 doesn't reach the minimum brightness.

I'm trying to look deeper, hope someone would help.

In Linux:
xrandr --prop | grep BACKLIGHT
BACKLIGHT: 16 (0x00000010) range:  (0,976)

sudo sh -c 'echo 16 > /sys/class/backlight/intel_backlight/brightness'

Gives the minimum brightness.

Hero DSDT:
Scope (_SB)
Device (PNLF)
Name (_HID, EisaId ("APP0002"))
Name (_CID, "backlight")
Name (_UID, 0x0A)
Name (_STA, 0x0B)

Maybe the problem is that macosx use 10 steps and actual driver has different granularity/lowest values?



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I've found that my B570's minimum brightness is actually "off". If I press Fn + Insert enough times, the display can actually be turned off. The maximum is reached with Fn + Home about 3/4 of the way across the on-screen brightness indicator.

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