If I use the hub's PSU, the LED nearest the power socket comes on. When I plug the USB B-to-A cable between the Pi and the hub, the LED nearest the USB-B socket does not light. However, the syslog does show a new entry, whilst lsusb does not:
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$ tail /var/log/syslog
Apr 18 22:03:41 rpi1 kernel: [ 3413.482078] usb 1-1.2: new high-speed USB device number 11 using dwc_otg
$ lsusb
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.When I plug devices into the USB sockets on the hub, their own LEDs light... so they're getting power, but they do not appear under lsusb and there's no mention of anything in syslog.
I've also tried this hub on my desktop computer (running Ubuntu 12.04 64-bit), and the situation is pretty much the same... I can't get anything plugged into the hub to appear. The only difference is that the syslog entry reads:
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Apr 21 00:02:06 desktop kernel: [ 1932.287754] usb 1-1.6: new high-speed USB device number 4 using ehci_hcd
Apr 21 00:02:06 desktop kernel: [ 1932.315775] hub 1-1:1.0: unable to enumerate USB device on port 6