Comment # 23 on bug 1021325 from Tony Mechelynck

(In reply to Oliver Neukum from comment #22)
> It is possible that your power supply is overwhelmed. Can you confirm the
> storage devices work separately on the same ports?

They used to work together on what I called slots C and D in comment #21, but
I'll try. Stay tuned to this station.
> 
> And please provide lsusb -v and lsusb -t for the working state.

linux-2iyu:~ # lsusb -t
/:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
    |__ Port 4: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
    |__ Port 5: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 2: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
linux-2iyu:~ #

lsusb -v is a lot more verbose, I'll add it as an attachment.