https://bugs.kde.org/show_bug.cgi?id=391633
Bug ID: 391633
Summary: Screen brightness cannot be adjusted from keyboard or
UI
Product: Powerdevil
Version: 5.12.2
Platform: Neon Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: kdeb...@d3801741e.33mail.com
Target Milestone: ---
Similar to https://bugs.kde.org/show_bug.cgi?id=368221 but on a Dell Inspiron
13
$ lsb_release -a
Distributor ID:neon
Description:KDE neon User Edition 5.12
Release: 16.04
Codename: xenial
$ uname -a
Linux faster 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
After 5.12 update the brightness of the screen cannot be adjusted from the
keyboard, from the "Brightness and Battery" widget and even from "Energy
Saving" in System Settings.
>From the keyboard: pressing Fn and brightness up/down keys (F12, F11
respectively) does not change the brightness of the screen. The screen
brightness indicator is shown and there are changes in the bar reflective of
the key combination pressed but no change in screen brightness.
I ran the command `journalctl -af` and this was the only output when changing
the brightness from the keyboard:
Mar 09 15:53:53 faster dbus[1129]: [system] Activating service
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Mar 09 15:53:53 faster org.kde.powerdevil.backlighthelper[6958]: QDBusArgument:
read from a write-only object
Mar 09 15:53:53 faster org.kde.powerdevil.backlighthelper[6958]: QDBusArgument:
read from a write-only object
Mar 09 15:53:53 faster org.kde.powerdevil.backlighthelper[6958]: QDBusArgument:
read from a write-only object
Mar 09 15:53:53 faster dbus[1129]: [system] Successfully activated service
'org.kde.powerdevil.backlighthelper'
>From the Brightness and Battery widget and Energy Saving in System Settings:
dragging control has no impact on the brightness of the screen.
I ran the command `journalctl -af` and this was the only output when changing
the brightness from the settings mentioned above:
Mar 09 15:56:04 faster dbus[1129]: [system] Activating service
name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Mar 09 15:56:04 faster org.kde.powerdevil.backlighthelper[7014]: QDBusArgument:
read from a write-only object
Mar 09 15:56:04 faster org.kde.powerdevil.backlighthelper[7014]: QDBusArgument:
read from a write-only object
Mar 09 15:56:04 faster org.kde.powerdevil.backlighthelper[7014]: QDBusArgument:
read from a write-only object
Mar 09 15:56:04 faster dbus[1129]: [system] Successfully activated service
'org.kde.powerdevil.backlighthelper'
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