Public bug reported:
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.
** Affects: oem-priority
Importance: Undecided
Status: New
** Affects: oem-priority/xenial
Importance: Undecided
Status: New
** Affects: unity-settings-daemon
Importance: Unknown
Status: Unknown
** Affects: unity-settings-daemon (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: GNOME Bug Tracker #782155
https://bugzilla.gnome.org/show_bug.cgi?id=782155
** Also affects: unity-settings-daemon via
https://bugzilla.gnome.org/show_bug.cgi?id=782155
Importance: Unknown
Status: Unknown
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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
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