lxqt-powermanagement doesn't dim the screen when idle timer is supposed to run out

Is this a new report?

Yes

System Info

Linux gadell 6.11.7-300.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Nov 8 19:23:10 UTC 2024 x86_64 GNU/Linux

Package(s) Affected

lxqt-powermanagement-2.0.0-1.fc41.x86_64

Does a report exist for this bug with the project's home (upstream) and/or another distro?

No response

Expected behaviour

After idle time, the system is expected to suspend.

Actual behaviour

After idle time (and also lot more), the system doesn't suspend ...

Starting from commandline:

$ lxqt-powermanagement
kf.idletime: Could not find any system poller plugin
qt.core.qobject.connect: QObject::connect(KAbstractIdleTimePoller, KIdleTime): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(KAbstractIdleTimePoller, KIdleTime): invalid nullptr parameter

Steps to reproduce

1. stop the usual daemon (started by system) doing
   $ killall lxqt-powermanager

2. Start the tool
   $ lxqt-powermanagement

3. wait for idle-time (in my case: 1 minute), and see it doesn't suspend.

Start by reproducing the report with lxqt-powermanager stopped, then launch lxqt-powermanagement and observe the reported KIdleTime poller errors after the idle interval. Trace the idle-time and suspend behavior from that entry point; done means the configured idle action occurs reliably without those errors.