Thunar doesn't auto-mount USB devices with default setup

After installing and configuring Thunar Volume Manager for Arch Linux it doesn't mount any USB devices automatically: $ thunar thunar-volman: Unsupported USB device type. thunar-volman: Unsupported USB device type. thunar-volman: Could not detect the volume corresponding to the device. thunar-volman: Could not detect the volume corresponding to the device. (Both messages are printed twice when inserting a single USB drive.) Polkit seems to be running as expected : $ loginctl show-session $XDG_SESSION_ID Id=c1 Timestamp=Tue 2013-11-19 20:54:41 GMT TimestampMonotonic=33281762 VTNr=7 Display=:0.0 Remote=no RemoteUser=root Service=slim Scope=session-c1.scope Leader=308 Audit=0 Type=x11 Class=user Active=yes State=active IdleHint=no IdleSinceHint=0 IdleSinceHintMonotonic=0 Name=username There are a bunch of random tips in this thread , but at least some of them seem at odds with the wiki: gvfs is mentioned, although the wiki only mentions it as a requirement for browsing remote locations . Manual mounting works fine: $ sudo mount /dev/sde1 /media/foo $ mount | grep sde1 /dev/sde1 on /media/foo type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)