Hi, as already reported here:

https://bugs.kde.org/show_bug.cgi?id=355687

and here

http://blog.broulik.de/2015/02/power-management-in-5-3/#comment-369

autosuspension stopped working on my wetab (https://en.wikipedia.org/wiki/WeTab#Technical_specifications). As at the same time (AC mode -> battery mode) the backlight was not being set properly, we first thought that the bug might be in powerdevil. However, that turned out to be a completely unrelated issue.

So what happens? Nothing. ;) If I unplug the AC cable from the wetab, it does not autosuspend after the given time period. It worked flawlessly before with KDE4 (e.g. kdelibs kidletime). So maybe something changed in the KF5 version? Some tighter thresholds? Granted, the wetab is not very strong, so there is always a little pressure on the CPU. I did some tests, though:

Linux 4.2.5-1-ARCH (wetab)      22.11.2015      _x86_64_        (2 CPU)

15:30:16        CPU     %user     %nice   %system   %iowait    %steal     %idle
15:30:18        all      0,51      0,00      2,28      0,00      0,00     97,21
15:30:20        all      0,00      0,00      2,79      0,00      0,00     97,21
15:30:22        all      0,51      0,00      1,79      0,00      0,00     97,70
15:30:24        all      3,32      0,00      4,86      1,28      0,00     90,54
15:30:26        all      0,26      0,00      1,79      0,00      0,00     97,96
15:30:28        all      5,41      0,00      3,87      0,00      0,00     90,72
15:30:30        all      0,26      0,00      1,29      0,00      0,00     98,46
15:30:32        all      0,77      0,00      2,04      0,00      0,00     97,19
15:30:34        all      0,51      0,00      2,81      0,00      0,00     96,68
15:30:36        all      0,77      0,00      2,30      0,00      0,00     96,93
15:30:38        all      0,51      0,00      1,28      0,00      0,00     98,21
15:30:40        all      0,25      0,00      2,29      0,00      0,00     97,46
15:30:42        all      0,26      0,00      2,04      0,00      0,00     97,70
15:30:44        all      1,02      0,00      2,30      0,00      0,00     96,68
15:30:46        all      1,28      0,00      2,81      0,00      0,00     95,92
15:30:48        all      0,00      0,00      2,30      0,00      0,00     97,70
15:30:50        all      0,00      0,00      2,54      0,00      0,00     97,46
15:30:52        all      0,51      0,00      2,54      0,00      0,00     96,95
15:30:54        all      3,31      0,00      4,33      1,02      0,00     91,35
15:30:56        all      0,00      0,00      1,55      0,00      0,00     98,45
Average:        all      0,97      0,00      2,49      0,11      0,00     96,43

In my opinion, this should be idle 'enough'. Are there any thresholds? Any place to change them? Can I get some debug messages from files, kded5 or similar?

Thanks in advance. If you need further information, let me know.