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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Andreas Hohenegger, if you have a bug in Ubuntu, the Ubuntu Kernel team, Ubuntu Bug Control team, and Ubuntu Bug Squad would like you to please file a new report by executing the following in a terminal while booted into a Ubuntu repository kernel (not a mainline one) via:
ubuntu-bug linux

For more on this, please read the official Ubuntu documentation:
Ubuntu Bug Control and Ubuntu Bug Squad: https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue
Ubuntu Kernel Team: https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
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When opening up the new report, please feel free to subscribe me to it.

Please note, not filing a new report would delay your problem being
addressed as quickly as possible.

No need exists to comment here at this time. After reading the above
documentation in it's entirety, if you have further questions, you are
welcome to redirect them to the appropriate mailing list or forum via
http://www.ubuntu.com/support/community/mailinglists , or you may
contact me directly.

Thank you for your understanding.

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https://bugs.launchpad.net/bugs/888764

Title:
  SATA link frequently resetting

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  I installed Ubuntu 11.10 on a brand-new Lenovo Thinkpad T520. I can
  use the system without notable problem (though I have not run any
  performance tests yet), however the kernel frequently (every few
  seconds) writes the following error messages to /var/log/syslog:

  .....
  kernel: [ 1814.181384] ata4: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
  kernel: [ 1814.181395] ata4: irq_stat 0x00000040, connection status changed
  kernel: [ 1814.181402] ata4: SError: { CommWake DevExch }
  kernel: [ 1814.181416] ata4: hard resetting link
  kernel: [ 1814.903561] ata4: SATA link down (SStatus 0 SControl 300)
  kernel: [ 1814.919517] ata4: EH complete
  kernel: [ 1819.682620] ata4: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
  kernel: [ 1819.682631] ata4: irq_stat 0x00000040, connection status changed
  kernel: [ 1819.682637] ata4: SError: { CommWake DevExch }
  kernel: [ 1819.682651] ata4: hard resetting link
  kernel: [ 1820.403106] ata4: SATA link down (SStatus 0 SControl 300)
  kernel: [ 1820.419060] ata4: EH complete
  kernel: [ 1825.277218] ata4: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
  kernel: [ 1825.277228] ata4: irq_stat 0x00000040, connection status changed
  kernel: [ 1825.277234] ata4: SError: { DevExch }
  kernel: [ 1825.277246] ata4: limiting SATA link speed to 1.5 Gbps
  kernel: [ 1825.277253] ata4: hard resetting link
  kernel: [ 1825.998398] ata4: SATA link down (SStatus 0 SControl 310)
  kernel: [ 1826.014355] ata4: EH complete
  ....

  Again, the system is brand-new and hence I guess that this is no
  hardware problem. Searching the web I found that someone else with a
  T520 has a similar problem:
  http://comments.gmane.org/gmane.linux.kernel/1207661

  Thank you very much in advance!

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-12-generic 3.0.0-12.20
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  matthias   1566 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf3a20000 irq 46'
     Mixer name	: 'Conexant CX20590'
     Components	: 'HDA:14f1506e,17aa21cf,00100002 HDA:14f12c06,17aa2122,00100000'
     Controls      : 8
     Simple ctrls  : 5
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
     Mixer name	: 'ThinkPad EC (unknown)'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Thu Nov 10 22:13:05 2011
  HibernationDevice: RESUME=UUID=31e78c61-0d88-4374-8362-12e69b42dfa3
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: LENOVO 4242PT2
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=b0a2add5-ac89-412c-ae05-b0550b8acc9d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-12-generic N/A
   linux-backports-modules-3.0.0-12-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/08/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8AET51WW (1.31 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4242PT2
  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:bvr8AET51WW(1.31):bd08/08/2011:svnLENOVO:pn4242PT2:pvrThinkPadT520:rvnLENOVO:rn4242PT2:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4242PT2
  dmi.product.version: ThinkPad T520
  dmi.sys.vendor: LENOVO

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