After installing and configuring [Thunar Volume Manager for Arch Linux](https://wiki.archlinux.org/index.php/Thunar#Thunar_Volume_Manager) 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](https://wiki.archlinux.org/index.php/Polkit) seems to be [running as expected](https://wiki.archlinux.org/index.php/General_Troubleshooting#Session_permissions):

```
$ 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](https://bbs.archlinux.org/viewtopic.php?id=111867), 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](https://wiki.archlinux.org/index.php/Thunar#Using_Thunar_to_browse_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)

```