https://bugs.kde.org/show_bug.cgi?id=403125
Bug ID: 403125
Summary: Setting minimal brightness level on many latest
Intel-based devices turn off backlight
Product: Powerdevil
Version: 5.13.5
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: russianneuroman...@ya.ru
Target Milestone: ---
SUMMARY
Some HP devices (probably many) such as HP EliteBook Folio G1 and HP Elite x2
1013 G3 turn off backlight if user set minimal brightness level. Due to
unresolved issues with hp_wmi brightness hotkeys doesn't work, so user left
with black screen and no convenient option that would let him turn backlight on
again. (Hence major severity.)
Same happen not only on HP devices but also on other devices, such as GPD Win 2
and ASUS UX550GE.
I propose to limit minimal brightness level for such devices to prevent
backlight from turning off.
STEPS TO REPRODUCE
1. Set brightness to minimal level
OBSERVED RESULT
Brightness is turned off
EXPECTED RESULT
Brightness is set to minimal level, but not turned off.
SOFTWARE/OS VERSIONS
Linux: Kubuntu 18.10
KDE Plasma Version: Plasma 5.13.5
KDE Frameworks Version: 5.50
Qt Version: 5.11.1
ADDITIONAL INFORMATION
Intel not planning to resolve this issue in driver:
https://bugs.freedesktop.org/show_bug.cgi?id=108618
Similar issue is resolved in Gnome Settings Daemon:
https://gitlab.gnome.org/GNOME/gnome-settings-daemon/issues/54
https://gitlab.gnome.org/GNOME/gnome-settings-daemon/merge_requests/17
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