Dne Ne 4. března 2012 13:58:36, Maciek Borzecki napsal(a): > I'm seeing an odd issue with KDE and screen backlight control. I'm > running Thinkpad T60, with KDE 4.7 (from updates) and unfortunately > the backlight control does not work. Pressing Fn+Home/Fn+End does not > seem to have any effect. I normally have to tweak hotkey mask to > something like 0xffffff in order to have the proper key events appear, > and it does work but only in Gnome and Xfce. > Before anyone suggests reinstalling bash, I've already done it > (otherwise it wouldn't work in Xfce). > > Looking at the logs: > - kded debugs: > kded(2495) PowerDevil::BackendLoader::loadBackend: Loading UPower backend... > kded(2495) PowerDevil::BackendLoader::loadBackend: Success! > kded(2495) KDEDPowerDevil::init: Backend loaded, loading core > kded(2495) PowerDevil::Core::loadCore: Core loaded, initializing backend > kded(2495) PowerDevilUPowerBackend::brightness: Screen brightness:  0 > <---- why is current brightness 0? > kded(2495) PowerDevilUPowerBackend::init: current screen brightness:  0 > kded(2495) PowerDevilUPowerBackend::init: Can suspend > kded(2495) PowerDevilUPowerBackend::init: Can hibernate > kded(2495) PowerDevil::Core::onBackendReady: Backend is ready, KDE > Power Management system initialized > > - messages - nothing about backlight helper being activated > - .xsession-errors - nothing related > > Since it does not work with 4.7 from updates, I updated to 4.8 from > kde48 repo. Unfortunately, with similar results. > > As a last resort I checked with KDE live spin, and amazingly, > backlight control works. So something between the current version of > packages and the one from live KDE spin, things got broken. > > Correct me if I'm wrong, but looking at the code, I see that in order > to control the backlight, there's a helper program > (/usr/libexec/kde4/backlighthelper) which starts through dbus > activation, and exposes brigthness, setbrigthness methods. I take that > once started the demon should remain running at lest for some time. > Now in KDE spin, that happens to be the case, I can clearly see > backlighthelper process listed in ps output (there are also logs in > messages, that activation of backlighthelper was successful). > However, right now, no such log is to be found, as if for some reason > backlight helper does not get started. > > Any ideas on how to proceed with debugging this? > > Thanks, > -- > Maciek Borzecki > _______________________________________________ > kde mailing list > kde(a)lists.fedoraproject.org > https://admin.fedoraproject.org/mailman/listinfo/kde > New to KDE4? - get help from http://userbase.kde.org Please post the result from "ls /sys/class/backlight/" on both systems -- Lukáš Tinkl <ltinkl(a)redhat.com&gt; Software Engineer - Base Operating Systems Brno KDE developer <lukas(a)kde.org&gt; Red Hat Inc.                               http://cz.redhat.com _______________________________________________ kde mailing list kde(a)lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/kde New to KDE4? - get help from http://userbase.kde.org