[Powerdevil] [Bug 355687] New: Powerdevil does not act (e.g. suspend, dim) when switching to battery mode

[Wilhelm Eger via KDE Bugzilla]

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

            Bug ID: 355687
           Summary: Powerdevil does not act (e.g. suspend, dim) when
                    switching to battery mode
           Product: Powerdevil
           Version: 5.4.3
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: plasma-devel at kde.org
          Reporter: wilhelm.eger at googlemail.com

Hey,

I reported this loosely some time ago in the comments of this blogpost:

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

So the bug is still there. My system is a wetab, which is basically an old
intel atom system
(https://en.wikipedia.org/wiki/WeTab#Technical_specifications). Plasma runs
fine on it. However, the following bug remains:

Let's say powerdevil is configured to dim the brightness of the screen to 50%
when running in battery mode and to go to full brightness (100%) if the power
cable is plugged in. Expected behavior would be to see the change in brightness
when plugging the cable in and out.

However, I can only observe a dimming action when going from battery mode to
plugged in mode. The brightness slider works. So I plug out the cable, slide
brightness to 50%, plug the cable in and the brightness goes up to 100%.

The other way round, however, does not work. If I am in plugged in mode and the
brightness is at 100%, the brightness stays at 100% when the cable is plugged
out.

The system also does not go in suspend when being in battery mode even if it is
switched on the configuration. This bothers me most.

So there seems to be a problem in that powerdevil does not act on being in
battery mode even thought the modes are recognized (simply see by the change of
the powerdevil icon when plugging, unplugging the cable).

I searched the systems for other daemons being repsonsible for this, e.g. tlp,
laptop-mode etc. There is nothing on the computer like that. I also disabled
systemd backlight control.

Btw. I just checked this behavior on my Acer 7750G (i5) with AMD graphics card.
It is the same! I just never realized, as I never unplug the cable. Or very
rarely.

So it seems not to be a hardware related bug.

Please let me know if you need more information.

Reproducible: Always

Steps to Reproduce:
1. Configure backlight to 50% for battery mode
2. Unplug cable to enter battery mode
3. Look at the backlight slider

Actual Results:  
Backlight is still at 100%

Expected Results:  
Backlight should switch to 50%

-- 
You are receiving this mail because:
You are the assignee for the bug.