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.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1381625 Title: Adjust brightness to lowest value caused screen whole black Status in HWE Next Project: Confirmed Status in linux package in Ubuntu: Confirmed Status in unity-settings-daemon package in Ubuntu: New Bug description: [Impact] When adjusting screen brightness to lowest value, it turns screen backlight off. [Test Case] 1. Install Image 2. Press System's brightness hotkey to adjust the brightness level to the lowest or 3. Go to System "Settings" -> "Brightness & Lock" to adjust brightness level to the lowest 4. Check if the screen display still has backlight Expected results: There is still screen backlight Actual results: Sceen backlight is turned off To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1381625/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
