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[SOLVED][KDE 5] Can't control my backlight brightness
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AnOriginalNick
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PostPosted: Thu Aug 27, 2015 11:27 am    Post subject: [SOLVED][KDE 5] Can't control my backlight brightness Reply with quote

Hello there.

After migrating to the KDE5 I cannot control brightness of my notebook backlight through standard means, it works manually through /sys/... but the battery widget reports that backlight control is unavailable. Is there some obscure dependency I am missing?

Cheers.


Last edited by AnOriginalNick on Wed Sep 02, 2015 12:42 pm; edited 1 time in total
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albright
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Joined: 16 Nov 2003
Posts: 2539
Location: Near Toronto

PostPosted: Thu Aug 27, 2015 12:53 pm    Post subject: Reply with quote

do you see acpi events in your system log when you
try to change screen brightness?
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kensington
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Joined: 02 Jan 2013
Posts: 175
Location: Australia

PostPosted: Thu Aug 27, 2015 4:12 pm    Post subject: Reply with quote

Do you have powerdevil installed, and if so which version? Do you use systemd, and how do you launch your Plasma session?
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AnOriginalNick
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PostPosted: Thu Aug 27, 2015 7:19 pm    Post subject: Reply with quote

kensington wrote:
Do you have powerdevil installed, and if so which version? Do you use systemd, and how do you launch your Plasma session?


The list of the kde software installed:
kde-apps/ark-4.14.3-r1
kde-apps/dolphin-4.14.3
kde-apps/gwenview-4.14.3
kde-apps/kcalc-4.14.3
kde-apps/kde4-l10n-15.08.0
kde-apps/kde-dev-scripts-4.14.3
kde-apps/kdialog-4.14.3
kde-apps/kfind-4.14.3
kde-apps/kioclient-4.14.3
kde-apps/kmix-15.08.0
kde-apps/konsole-4.14.3
kde-apps/kwrite-4.14.3
kde-apps/libkdcraw-4.14.3-r1
kde-apps/libkipi-4.14.3
kde-apps/libkonq-4.14.3
kde-apps/oxygen-icons-15.04.3
kde-apps/umbrello-4.14.3
kde-base/baloo-4.14.3
kde-base/baloo-widgets-4.14.3
kde-base/kactivities-4.13.3
kde-base/katepart-4.14.3
kde-base/kde-env-4.14.3
kde-base/kdelibs-4.14.11
kde-base/kdepimlibs-4.14.10
kde-base/kfilemetadata-4.14.3
kde-base/pykde4-4.14.3
kde-frameworks/attica-5.13.0
kde-frameworks/baloo-5.13.0
kde-frameworks/bluez-qt-5.13.0
kde-frameworks/extra-cmake-modules-5.13.0
kde-frameworks/frameworkintegration-5.13.0
kde-frameworks/kactivities-5.13.0
kde-frameworks/karchive-5.13.0
kde-frameworks/kauth-5.13.0
kde-frameworks/kbookmarks-5.13.0
kde-frameworks/kcmutils-5.13.0
kde-frameworks/kcodecs-5.13.0
kde-frameworks/kcompletion-5.13.0
kde-frameworks/kconfig-5.13.0
kde-frameworks/kconfigwidgets-5.13.0
kde-frameworks/kcoreaddons-5.13.0
kde-frameworks/kcrash-5.13.0
kde-frameworks/kdbusaddons-5.13.0
kde-frameworks/kdeclarative-5.13.0
kde-frameworks/kded-5.13.0
kde-frameworks/kdelibs4support-5.13.0
kde-frameworks/kdesignerplugin-5.13.0
kde-frameworks/kdesu-5.13.0
kde-frameworks/kdewebkit-5.13.0
kde-frameworks/kdoctools-5.13.0
kde-frameworks/kemoticons-5.13.0
kde-frameworks/kf-env-3
kde-frameworks/kfilemetadata-5.13.0
kde-frameworks/kglobalaccel-5.13.0
kde-frameworks/kguiaddons-5.13.0
kde-frameworks/khtml-5.13.0
kde-frameworks/ki18n-5.13.0
kde-frameworks/kiconthemes-5.13.0
kde-frameworks/kidletime-5.13.0
kde-frameworks/kinit-5.13.0
kde-frameworks/kio-5.13.0
kde-frameworks/kitemmodels-5.13.0
kde-frameworks/kitemviews-5.13.0
kde-frameworks/kjobwidgets-5.13.0
kde-frameworks/kjs-5.13.0
kde-frameworks/kjsembed-5.13.0
kde-frameworks/knewstuff-5.13.0
kde-frameworks/knotifications-5.13.0
kde-frameworks/knotifyconfig-5.13.0
kde-frameworks/kpackage-5.13.0
kde-frameworks/kparts-5.13.0
kde-frameworks/kpeople-5.13.0
kde-frameworks/kpty-5.13.0
kde-frameworks/kross-5.13.0
kde-frameworks/krunner-5.13.0
kde-frameworks/kservice-5.13.0
kde-frameworks/ktexteditor-5.13.0
kde-frameworks/ktextwidgets-5.13.0
kde-frameworks/kunitconversion-5.13.0
kde-frameworks/kwallet-5.13.0-r1
kde-frameworks/kwidgetsaddons-5.13.0
kde-frameworks/kwindowsystem-5.13.0
kde-frameworks/kxmlgui-5.13.0
kde-frameworks/kxmlrpcclient-5.13.0
kde-frameworks/networkmanager-qt-5.13.0
kde-frameworks/plasma-5.13.0
kde-frameworks/solid-5.13.0
kde-frameworks/sonnet-5.13.0
kde-frameworks/threadweaver-5.13.0
kde-misc/synaptiks-0.8.1-r4
kde-plasma/bluedevil-5.4.0
kde-plasma/breeze-5.4.0
kde-plasma/kde-cli-tools-5.4.0
kde-plasma/kdecoration-5.4.0
kde-plasma/kde-gtk-config-5.4.0
kde-plasma/kdeplasma-addons-5.4.0
kde-plasma/kgamma-5.4.0
kde-plasma/khelpcenter-5.4.0
kde-plasma/khotkeys-5.4.0
kde-plasma/kinfocenter-5.4.0
kde-plasma/kmenuedit-5.4.0
kde-plasma/kscreen-5.4.0
kde-plasma/ksshaskpass-5.4.0
kde-plasma/ksysguard-5.4.0
kde-plasma/kwallet-pam-5.4.0
kde-plasma/kwayland-5.4.0
kde-plasma/kwayland-integration-5.4.0
kde-plasma/kwin-5.4.0
kde-plasma/kwrited-5.4.0
kde-plasma/libkscreen-5.4.0
kde-plasma/libksysguard-5.4.0
kde-plasma/milou-5.4.0
kde-plasma/oxygen-5.4.0
kde-plasma/oxygen-fonts-5.4.0
kde-plasma/plasma-desktop-5.4.0
kde-plasma/plasma-mediacenter-5.4.0
kde-plasma/plasma-meta-5.4.0
kde-plasma/plasma-nm-5.4.0
kde-plasma/plasma-pa-5.4.0
kde-plasma/plasma-sdk-5.4.0
kde-plasma/plasma-workspace-5.4.0
kde-plasma/plasma-workspace-wallpapers-5.4.0
kde-plasma/polkit-kde-agent-5.4.0
kde-plasma/powerdevil-5.4.0
kde-plasma/sddm-kcm-5.4.0
kde-plasma/systemsettings-5.4.0
kde-plasma/user-manager-5.4.0

I am using OpenRC. I am launching it in the usual way by setting displaymanager to sddm, which launches my plasma sessions. Perhaps I am missing some permissions for sddm or/and plasma?
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kensington
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Joined: 02 Jan 2013
Posts: 175
Location: Australia

PostPosted: Thu Aug 27, 2015 7:20 pm    Post subject: Reply with quote

You could try with some other display manager like lightdm - there are known issues with openrc and sddm due to lack of consolekit support.
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AnOriginalNick
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PostPosted: Thu Aug 27, 2015 7:58 pm    Post subject: Reply with quote

Finally solved id! It was a polkit issue, added a rule for backlight and it works now.

For reference

Code:

polkit.addRule(function(action, subject) {
        if (action.id.indexOf("org.kde.powerdevil.backlighthelper.") == 0 &&
        subject.isInGroup("users")) {
                return polkit.Result.YES;
        }
});
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Havin_it
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Joined: 17 Jul 2005
Posts: 1163
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PostPosted: Tue Sep 22, 2015 1:48 pm    Post subject: Reply with quote

AnOriginalNick wrote:
Finally solved id! It was a polkit issue, added a rule for backlight and it works now.

For reference

Code:

polkit.addRule(function(action, subject) {
        if (action.id.indexOf("org.kde.powerdevil.backlighthelper.") == 0 &&
        subject.isInGroup("users")) {
                return polkit.Result.YES;
        }
});


AnOriginalNick, to what file would I add this rule?
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AnOriginalNick
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PostPosted: Tue Sep 22, 2015 6:55 pm    Post subject: Reply with quote

Havin_it wrote:
AnOriginalNick wrote:
Finally solved id! It was a polkit issue, added a rule for backlight and it works now.

For reference

Code:

polkit.addRule(function(action, subject) {
        if (action.id.indexOf("org.kde.powerdevil.backlighthelper.") == 0 &&
        subject.isInGroup("users")) {
                return polkit.Result.YES;
        }
});


AnOriginalNick, to what file would I add this rule?


You should add it to /etc/polkit-1/rules.d/<some_number>-<name>.rules (for example 10-backlight.rules). Do note that this particular rule requires your user to be in users group, you can easily edit that by removing "&& subject.isInGroup("users")" clause if you want (or adding your user to users). Polkit automatically updates current rules after some time period, but you can hasten the process by rebooting.
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Havin_it
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Joined: 17 Jul 2005
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PostPosted: Sun Sep 27, 2015 1:10 pm    Post subject: Reply with quote

AnOriginalNick wrote:
Havin_it wrote:
AnOriginalNick wrote:
Finally solved id! It was a polkit issue, added a rule for backlight and it works now.

For reference

Code:

polkit.addRule(function(action, subject) {
        if (action.id.indexOf("org.kde.powerdevil.backlighthelper.") == 0 &&
        subject.isInGroup("users")) {
                return polkit.Result.YES;
        }
});


AnOriginalNick, to what file would I add this rule?


You should add it to /etc/polkit-1/rules.d/<some_number>-<name>.rules (for example 10-backlight.rules). Do note that this particular rule requires your user to be in users group, you can easily edit that by removing "&& subject.isInGroup("users")" clause if you want (or adding your user to users). Polkit automatically updates current rules after some time period, but you can hasten the process by rebooting.


Thanks; it works like a charm!

Note to self: must educate myself a bit about polkit, I've body-swerved doing so whenever possible but a working knowledge might help me resolve a lot of the minor account-related quirks I put up with daily (like this one).
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mdshort
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Joined: 06 Dec 2004
Posts: 157

PostPosted: Fri Apr 22, 2016 3:58 am    Post subject: Reply with quote

Thanks you! This resolved my issue. This file should be provided by default.
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erg_samowzbudnik
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Posts: 50
Location: uk/sticks

PostPosted: Mon Jul 03, 2017 1:19 pm    Post subject: Reply with quote

Though the thread is old perhaps it will help someone:


had the same issue, what worked for me was simply to append acpi_backlight=video to kernel parameters in grub.conf

graphic card Nvidia GeForce GTX 680M and all the relevant kernel options compiled in
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