Created attachment 7781 Patch to fix the isseu If XFCE and LXQt are installed on the same machine, XFCE Power Manager will be auto started under LXQt. LXQt has it's own power manager.
Luís Pereira referenced this bugreport in commit 12e78a69610ce04d571c49faff7fec63fd3709f4 Don't autostart the power manager in the LXQt DE (Bug #14450) https://git.xfce.org/xfce/xfce4-power-manager/commit?id=12e78a69610ce04d571c49faff7fec63fd3709f4
Thanks for the patch, fixed in git and will be part of the next release.