Doesn't apply always for me. For example changing from Performance to Presentation works properly for me.
The apparently associated KDE bug suggests that this issue is related to DPMS, so please aggregate some information about your graphics hardware: first run on a terminal lspci | grep VGA now please run sudo lspci -v -s 00:02.0 where 00:02.0 needs to be replaced by whatever number the first output started with. Finally please post the output of the last command as comment to this report. For me it is: 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev03) Subsystem: Dell Device 01bd Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at eff00000 (32-bit, non-prefetchable) [size=512K] I/O ports at eff8 [size=8] ** Changed in: kdebase-workspace (Ubuntu) Importance: Undecided => Low Status: New => Confirmed ** Bug watch added: KDE Bug Tracking System #177123 http://bugs.kde.org/show_bug.cgi?id=177123 ** Also affects: kdebase via http://bugs.kde.org/show_bug.cgi?id=177123 Importance: Unknown Status: Unknown -- Powerdevil is incredibly slow switching power modes https://bugs.launchpad.net/bugs/312549 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs