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[Michael Heuberger <michael.heuberger@xxxxxxxxxxxxxxxxx>]

@Christopher I am afraid, I won't do that. Using the latest upstream
kernel. In the past, when I tried this approach, I couldn't boot anymore
and got into trouble.

I had this issue for quite a while, over multiple Ubuntu versions. So I
believe this is a new bug.

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https://bugs.launchpad.net/bugs/1523765

Title:
  USB performance extremely unstable

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Since I upgraded from Trusty to Wily, the USB performance has become
  extremely unstable. Sometimes file transfers were fast, like 1GB in 30
  sec, then most days it is so slow like 1 GB in 20 minutes for no
  reason.

  Here some relevant log lines from the `dmesg` command when I USB is
  plugged in:

  ```
  [  496.912939] usb 4-5: new high-speed USB device number 2 using ehci-pci
  [  497.111419] usb 4-5: New USB device found, idVendor=1b1c, idProduct=1ab1
  [  497.111425] usb 4-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [  497.111428] usb 4-5: Product: Voyager
  [  497.111430] usb 4-5: Manufacturer: Corsair
  [  497.111433] usb 4-5: SerialNumber: AA40000000000825
  [  497.134497] usb-storage 4-5:1.0: USB Mass Storage device detected
  [  497.134600] scsi host12: usb-storage 4-5:1.0
  [  497.134713] usbcore: registered new interface driver usb-storage
  [  497.137090] usbcore: registered new interface driver uas
  [  498.420795] scsi 12:0:0:0: Direct-Access     Corsair  Voyager          1100 PQ: 0 ANSI: 0 CCS
  [  498.421211] sd 12:0:0:0: Attached scsi generic sg5 type 0
  [  498.913643] sd 12:0:0:0: [sdd] 15663104 512-byte logical blocks: (8.01 GB/7.46 GiB)
  [  498.914804] sd 12:0:0:0: [sdd] Write Protect is off
  [  498.914809] sd 12:0:0:0: [sdd] Mode Sense: 43 00 00 00
  [  498.915930] sd 12:0:0:0: [sdd] No Caching mode page found
  [  498.915934] sd 12:0:0:0: [sdd] Assuming drive cache: write through
  [  498.920710]  sdd: sdd1
  [  498.924684] sd 12:0:0:0: [sdd] Attached SCSI removable disk
  [ 1184.038007] usb 4-5: USB disconnect, device number 2
  ```

  these two lines appear in *red*

  ```
  [  498.915930] sd 12:0:0:0: [sdd] No Caching mode page found
  [  498.915934] sd 12:0:0:0: [sdd] Assuming drive cache: write through
  ```

  What can we do here? How can this be investigated and fixed properly?
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  michael-heuberger   4363 F.... pulseaudio
   /dev/snd/controlC2:  michael-heuberger   4363 F.... pulseaudio
   /dev/snd/controlC0:  michael-heuberger   4363 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=b0b47183-895a-4f27-bb25-40bd23028028
  InstallationDate: Installed on 2014-10-31 (403 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=UUID=b5b38333-3694-4441-8a13-50bf4dbf2f41 ro quiet
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-19-generic N/A
   linux-backports-modules-4.2.0-19-generic  N/A
   linux-firmware                            1.149.3
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: yes
   	Hard blocked: no
  Tags:  wily
  Uname: Linux 4.2.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo wireshark www-data
  _MarkForUpload: True
  dmi.bios.date: 08/06/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0803
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6X58D-E
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0803:bd08/06/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6X58D-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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