Comment 15 for bug 1381625

Hey, a small update. Lantern test v2 tests exactly what happens when brightness is set to 0. I have 10 samples so far and I will be able to analyze them today. My gut feeling is that acpi aka firmware control never tuns the backlight off entirely (so setting zero in userspace is safe) while raw control will just disable all light at the same level. I would suggest that for raw controls the bottom value should be 10% of max brightness. The actual value also depends on if the scale is linear or logarithmic which is on my TODO list to check in Lantern.