** Changed in: oem-priority/xenial
Status: New => Triaged
** Changed in: oem-priority/xenial
Importance: High => Medium
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https://bugs.launchpad.net/bugs/1691032
Title:
Some PCs still turn off the backlight by zero brightness even when the
maximum brightness level is less than 100
Status in OEM Priority Project:
Triaged
Status in OEM Priority Project xenial series:
Triaged
Status in Unity Settings Daemon:
Confirmed
Status in unity-settings-daemon package in Ubuntu:
New
Bug description:
Need to have fix in Bionic, better to have it in xenial.
The minimum brightness of the laptop screen panel may not be realistic
sometimes especially when having a problematic screen panel.
For example, Dell Precision 5720 AIO only has 9 levels in
/sys/class/backlight/intel_backlight/max_brightness because the wrong
settings in VBIOS. It is an all-in-one desktop PC and there is no
brightness hotkey to control the backlight. When we set 0 to
/sys/class/backlight/intel_backlight/brightness, it turns off the
panel's backlight and there is no way to brightness up the backlight
again so we can only avoid using 0 as the minimum backlight level.
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