kernel-packages team mailing list archive

[Zygmunt Krynicki <zygmunt.krynicki@xxxxxxxxxxxxx>]

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

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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

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