kernel-packages team mailing list archive

[Zygmunt Krynicki <zygmunt.krynicki@xxxxxxxxxxxxx>]

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.

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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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