To follow up, I went into my laptops BIOS , disabled USB3, checked in dmesg that xhci_hcd was no longer being used:
[Sun Nov 30 14:39:28 2014] usb 1-1.2: new high-speed USB device number 12 using ehci-pci [Sun Nov 30 14:39:28 2014] usb 1-1.2: New USB device found, idVendor=04c5, idProduct=128d [Sun Nov 30 14:39:28 2014] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [Sun Nov 30 14:39:28 2014] usb 1-1.2: Product: ScanSnap S1300i [Sun Nov 30 14:39:28 2014] usb 1-1.2: Manufacturer: FUJITSU And lo and behold, no more "rounding interval to 128 microframes" mesgs in dmesg and scanner works fine. Would be nice if ubuntu kernel devs could trac the discussion in the usb maillist and perhaps back port any patches that hopefully eventuates to fix this. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1102797 Title: 04c5:11a2 Fujitsu ScanSnap S1500 does not work on USB3 ports To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1102797/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
