[SOLVED]Dolphin automount not working

[lfs0a]

Enabled automatic mounting of removable devices in system settings,
But I can not see devices listed on the left panel of dolphin, they used to be there.
I have to mount manually.
I'm running KDE plasma.





I migrated from consolekit to elogind before to run wayland(wayland depends on elogind,right?)
I did some google,someone mentioned that this is a consolekit/polkit problem,
I recall what I did about consolekit,
So I migrated back to consolekit,reboot,still no removable devices notification.
Then I enable "udev" USE in /etc/portage/make.conf,update world,
I finally saw removable device notification,and I can mount with clicks!