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[Hideki Saito <hideki@xxxxxxxxxxxxxxx>]

This seems to be happening with generic USB thumbdrives, too. (This
one's unmarked promotional USB thumbdrive, but confirmed this happening
on two of the identical model.)

The below is kern.log of the relevant section.

Aug 21 15:14:24 madoka kernel: [  936.616305] usb 2-1: USB disconnect, device number 2
Aug 21 15:14:28 madoka kernel: [  940.471598] usb 2-2: new high-speed USB device number 3 using ehci-pci
Aug 21 15:14:28 madoka kernel: [  940.605182] usb 2-2: New USB device found, idVendor=cd12, idProduct=ef18
Aug 21 15:14:28 madoka kernel: [  940.605195] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug 21 15:14:28 madoka kernel: [  940.605203] usb 2-2: Product: DISK            
Aug 21 15:14:28 madoka kernel: [  940.605209] usb 2-2: Manufacturer: USB 2.0 
Aug 21 15:14:28 madoka kernel: [  940.605214] usb 2-2: SerialNumber: 4066037FC2C31922
Aug 21 15:14:28 madoka kernel: [  940.606551] scsi3 : usb-storage 2-2:1.0
Aug 21 15:14:29 madoka kernel: [  941.603475] scsi 3:0:0:0: Direct-Access     USB 2.0  DISK             1.00 PQ: 0 ANSI: 2
Aug 21 15:14:29 madoka kernel: [  941.606238] sd 3:0:0:0: Attached scsi generic sg2 type 0
Aug 21 15:14:29 madoka kernel: [  941.609269] sd 3:0:0:0: [sdb] 4075520 512-byte logical blocks: (2.08 GB/1.94 GiB)
Aug 21 15:14:29 madoka kernel: [  941.609883] sd 3:0:0:0: [sdb] Write Protect is off
Aug 21 15:14:29 madoka kernel: [  941.609909] sd 3:0:0:0: [sdb] Mode Sense: 0b 00 00 08
Aug 21 15:14:29 madoka kernel: [  941.611164] sd 3:0:0:0: [sdb] No Caching mode page present
Aug 21 15:14:29 madoka kernel: [  941.611173] sd 3:0:0:0: [sdb] Assuming drive cache: write through
Aug 21 15:15:00 madoka kernel: [  972.327875] usb 2-2: reset high-speed USB device number 3 using ehci-pci
Aug 21 15:15:31 madoka kernel: [ 1003.344758] usb 2-2: reset high-speed USB device number 3 using ehci-pci
Aug 21 15:16:02 madoka kernel: [ 1034.297549] usb 2-2: reset high-speed USB device number 3 using ehci-pci
Aug 21 15:16:33 madoka kernel: [ 1065.250606] usb 2-2: reset high-speed USB device number 3 using ehci-pci
Aug 21 15:16:33 madoka kernel: [ 1065.390248] sd 3:0:0:0: [sdb] No Caching mode page present
Aug 21 15:16:33 madoka kernel: [ 1065.390263] sd 3:0:0:0: [sdb] Assuming drive cache: write through

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https://bugs.launchpad.net/bugs/1215155

Title:
  regression in linux-image-3.8.0-29-generic: ipod shuffle 2g does not
  mount any more

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  starting with  linux-image-3.8.0-29-generic ipod shuffle 2g could not be mounted.
  with 3.8.0-27-generic works OK
  [   23.752494] USB Mass Storage support registered.
  [   24.752744] scsi 4:0:0:0: Direct-Access     Apple    iPod             2.70 PQ: 0 ANSI: 2
  [   24.754546] sd 4:0:0:0: Attached scsi generic sg2 type 0
  [   24.755357] sd 4:0:0:0: [sdc] 495616 2048-byte logical blocks: (1.01 GB/968 MiB)
  [   24.756585] sd 4:0:0:0: [sdc] Write Protect is off
  [   24.756588] sd 4:0:0:0: [sdc] Mode Sense: 64 00 00 08
  [   24.757226] sd 4:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
  [   24.758599] sd 4:0:0:0: [sdc] 495616 2048-byte logical blocks: (1.01 GB/968 MiB)
  [   24.769902]  sdc:
  [   24.771237] sd 4:0:0:0: [sdc] 495616 2048-byte logical blocks: (1.01 GB/968 MiB)
  [   24.772748] sd 4:0:0:0: [sdc] Attached SCSI removable disk

  
  with 3.8.0-29-generic  I get only 
  [  186.661052] scsi 5:0:0:0: Direct-Access     Apple    iPod             2.70 PQ: 0 ANSI: 2
  [  186.662692] sd 5:0:0:0: Attached scsi generic sg2 type 0
  [  186.663501] sd 5:0:0:0: [sdc] 495616 2048-byte logical blocks: (1.01 GB/968 MiB)
  [  186.664756] sd 5:0:0:0: [sdc] Write Protect is off
  [  186.664765] sd 5:0:0:0: [sdc] Mode Sense: 64 00 00 08
  [  186.666731] sd 5:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
  and nothing more, /dev/sdc does not exist

  The same behaviour on T500 and S10-3t. (had to roll back to 3.8.0-27)

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-29-generic (not installed)
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
  Uname: Linux 3.8.0-27-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ortyl      2029 F.... pulseaudio
  Date: Wed Aug 21 23:03:36 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=c6b1277b-2ac7-46e4-b8f3-ce7f93218a25
  InstallationDate: Installed on 2012-09-01 (354 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: LENOVO 20827SG
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-27-generic root=UUID=a20647bb-a321-40ad-96f0-47cbe5c02a92 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-27-generic N/A
   linux-backports-modules-3.8.0-27-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-01 (142 days ago)
  dmi.bios.date: 12/14/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6FET92WW (3.22 )
  dmi.board.name: 20827SG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6FET92WW(3.22):bd12/14/2011:svnLENOVO:pn20827SG:pvrThinkPadT500:rvnLENOVO:rn20827SG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20827SG
  dmi.product.version: ThinkPad T500
  dmi.sys.vendor: LENOVO

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