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[markus haider <markus.haider@xxxxxxxxxxxxxxxxxx>]

I found out, that this seems to be related to the SATA power management.
If I use powertop and enable "Enable SATA link power Managmenet for
host1", the errors stop.

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https://bugs.launchpad.net/bugs/1318218

Title:
  SATA problems on MacBook Pro 11,1?

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I installed Ubuntu 14.04 next to MacOS following the guide at
  https://help.ubuntu.com/community/MacBookPro11-1/Saucy/

  Looking into dmesg, I constantlz get entries like
  [  276.380934] ata1: SError: { PHYRdyChg }
  [  276.380943] ata1: hard resetting link
  [  277.103527] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
  [  277.103999] ata1.00: unexpected _GTF length (8)
  [  277.104504] ata1.00: unexpected _GTF length (8)
  [  277.104507] ata1.00: configured for UDMA/33
  [  277.104629] ata1: EH complete
  [  277.206319] ata1: exception Emask 0x10 SAct 0x0 SErr 0x10000 action 0xe frozen
  [  277.206328] ata1: irq_stat 0x00400000, PHY RDY changed
  [  277.206333] ata1: SError: { PHYRdyChg }
  [  277.206343] ata1: hard resetting link
  [  277.927757] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
  [  277.928425] ata1.00: unexpected _GTF length (8)
  [  277.929040] ata1.00: unexpected _GTF length (8)
  [  277.929051] ata1.00: configured for UDMA/33
  [  277.929168] ata1: EH complete
  [  278.030944] ata1: exception Emask 0x10 SAct 0x0 SErr 0x10000 action 0xe frozen
  [  278.030952] ata1: irq_stat 0x00400000, PHY RDY changed
  [  278.030957] ata1: SError: { PHYRdyChg }
  [  278.030965] ata1: hard resetting link
  [  278.752008] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
  [  278.752582] ata1.00: unexpected _GTF length (8)
  [  278.753140] ata1.00: unexpected _GTF length (8)
  [  278.753147] ata1.00: configured for UDMA/33
  [  278.753231] ata1: EH complete
  [  278.853417] ata1: exception Emask 0x10 SAct 0x0 SErr 0x10000 action 0xe frozen
  [  278.853424] ata1: irq_stat 0x00400000, PHY RDY changed
  [  278.853427] ata1: SError: { PHYRdyChg }
  [  278.853434] ata1: hard resetting link
  [  279.576258] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
  [  279.576881] ata1.00: unexpected _GTF length (8)
  [  279.577417] ata1.00: unexpected _GTF length (8)
  [  279.577427] ata1.00: configured for UDMA/33
  [  279.577491] ata1: EH complete
  [  279.677753] ata1: exception Emask 0x10 SAct 0x0 SErr 0x10000 action 0xe frozen
  [  279.677762] ata1: irq_stat 0x00400000, PHY RDY changed
  [  279.677767] ata1: SError: { PHYRdyChg }
  [  279.677776] ata1: hard resetting link
  [  280.400449] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
  [  280.401147] ata1.00: unexpected _GTF length (8)
  [  280.401722] ata1.00: unexpected _GTF length (8)
  [  280.401733] ata1.00: configured for UDMA/33
  [  280.401809] ata1: EH complete
  [  280.502117] ata1: exception Emask 0x10 SAct 0x0 SErr 0x10000 action 0xe frozen
  [  280.502127] ata1: irq_stat 0x00400000, PHY RDY changed
  [  280.502132] ata1: SError: { PHYRdyChg }

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  markus     1663 F.... pulseaudio
   /dev/snd/controlC1:  markus     1663 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat May 10 19:33:44 2014
  HibernationDevice: RESUME=UUID=c71381d2-e2f3-4c96-94ea-57b8986afd08
  InstallationDate: Installed on 2014-05-09 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Apple Inc. MacBookPro11,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=7584bc70-893a-4291-a1cb-4680f5e09d22 ro libata.force=noncq quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/29/2013
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP111.88Z.0138.B03.1310291227
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-189A3D4F975D5FFC
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-189A3D4F975D5FFC
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP111.88Z.0138.B03.1310291227:bd10/29/2013:svnAppleInc.:pnMacBookPro11,1:pvr1.0:rvnAppleInc.:rnMac-189A3D4F975D5FFC:rvrMacBookPro11,1:cvnAppleInc.:ct10:cvrMac-189A3D4F975D5FFC:
  dmi.product.name: MacBookPro11,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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