Comment 3 for bug 1000424

Please test the kernel in http://kernel.ubuntu.com/~manjo/precise/lp1000424-usb/

Please post results (dmesg snip) like I have done below for USB 3.0 port and USB 2.0 ports on your system.

I tested this kernel on a Lenovo system:

== BEFORE PATCH ==
[ 25.982350] eth1: no IPv6 routers present
[ 27.577663] usb 2-1.1: new high-speed USB device number 3 using ehci_hcd
[ 27.674465] scsi6 : usb-storage 2-1.1:1.0
[ 28.673788] scsi 6:0:0:0: Direct-Access JetFlash Transcend 16GB 1.00 PQ: 0 ANSI: 5
[ 28.674667] sd 6:0:0:0: Attached scsi generic sg3 type 0
[ 28.677284] sd 6:0:0:0: [sdc] 30871552 512-byte logical blocks: (15.8 GB/14.7 GiB)
[ 28.677832] sd 6:0:0:0: [sdc] Write Protect is off
[ 28.677839] sd 6:0:0:0: [sdc] Mode Sense: 23 00 00 00
[ 28.678454] sd 6:0:0:0: [sdc] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA
[ 28.682117] sdc: sdc1
[ 28.684179] sd 6:0:0:0: [sdc] Attached SCSI removable disk

== AFTER PATCH USB 3.0 PORT ==
[ 56.653501] usb 4-1: new SuperSpeed USB device number 2 using xhci_hcd
[ 56.672677] scsi6 : usb-storage 4-1:1.0
[ 57.669912] scsi 6:0:0:0: Direct-Access JetFlash Transcend 16GB 1.00 PQ: 0 ANSI: 5
[ 57.671100] sd 6:0:0:0: [sdc] 30871552 512-byte logical blocks: (15.8 GB/14.7 GiB)
[ 57.671185] sd 6:0:0:0: Attached scsi generic sg3 type 0
[ 57.671389] sd 6:0:0:0: [sdc] Write Protect is off
[ 57.671392] sd 6:0:0:0: [sdc] Mode Sense: 23 00 00 00
[ 57.671499] sd 6:0:0:0: [sdc] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA
[ 57.674480] sdc: sdc1
[ 57.675180] sd 6:0:0:0: [sdc] Attached SCSI removable disk

== AFTER PATCH USB 2.0 PORT ==
[ 112.468810] usb 4-1: USB disconnect, device number 2
[ 117.688925] usb 1-1.2: new high-speed USB device number 5 using ehci_hcd
[ 117.786131] scsi7 : usb-storage 1-1.2:1.0
[ 118.785809] scsi 7:0:0:0: Direct-Access JetFlash Transcend 16GB 1.00 PQ: 0 ANSI: 5
[ 118.788004] sd 7:0:0:0: Attached scsi generic sg3 type 0
[ 118.789848] sd 7:0:0:0: [sdc] 30871552 512-byte logical blocks: (15.8 GB/14.7 GiB)
[ 118.790287] sd 7:0:0:0: [sdc] Write Protect is off
[ 118.790294] sd 7:0:0:0: [sdc] Mode Sense: 23 00 00 00
[ 118.791072] sd 7:0:0:0: [sdc] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA
[ 118.796448] sdc: sdc1
[ 118.798525] sd 7:0:0:0: [sdc] Attached SCSI removable disk