Yup, same problem under 3.1.0-0301rc3-generic. Some bits from dmesg: [ 44.712024] xhci_hcd 0000:03:00.0: WARN: Stalled endpoint [ 44.712645] xhci_hcd 0000:03:00.0: WARN: Stalled endpoint [ 44.713118] sd 6:0:0:0: [sdd] No Caching mode page present [ 44.713122] sd 6:0:0:0: [sdd] Assuming drive cache: write through [ 44.713701] xhci_hcd 0000:03:00.0: WARN: Stalled endpoint [ 44.714392] xhci_hcd 0000:03:00.0: WARN: Stalled endpoint [ 44.714867] sd 6:0:0:0: [sdd] No Caching mode page present [ 44.714870] sd 6:0:0:0: [sdd] Assuming drive cache: write through [ 44.744800] sdd: sdd1 [ 141.160127] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot [ 191.370085] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot [ 191.590072] usb 9-1: device not accepting address 2, error -62
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