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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?