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lenovo b570 brightness control doesn't go to low 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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