Hey. I'm researching the behaviour of backlight in the wild and my current theory is that brightness of zero can equally well mean "dim" or "totally off". I don't have a test for that yet so the sample range is very small (the hardware I have at home + several contributions from the community) but that seems to be the case.
I also looked at windows API and I'm about to look at the current Microsoft certification requirements. The API says that the values are arbitrary and no mapping to actual light intensity can be assumed. If you want to track my work, please look at https://github.com/zyga/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