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[Andreas Hohenegger <888764@xxxxxxxxxxxxxxxxxx>]

I see this with Ubuntu saucy (Kernel 3.11.0-12-generic 64 bit.), on a
Thinkpad T520 as well. This seems to happen when the system is under
heavy workload and I experience system freezes at the same time (So it
does seem to have a usability impact for me).

[23391.818508] ata4: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[23391.818513] ata4: irq_stat 0x00000040, connection status changed
[23391.818516] ata4: SError: { CommWake DevExch }
[23391.818523] ata4: limiting SATA link speed to 1.5 Gbps
[23391.818525] ata4: hard resetting link
[23392.538993] ata4: SATA link down (SStatus 0 SControl 310)
[23392.554893] ata4: EH complete

Possibly related:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/539467

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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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