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[Alex <alex@xxxxxxxxxxxxxx>]

Further to my earlier comment, it seems that these settings don't
entirely eliminate SATA errors. I've tried with both "medium_power" and
"min_power" as settings for the link_power_management_policy, and still
get some errors. They're slightly different, and also less regular;
around 10 every 5 minutes as opposed to once a second on
"max_performance". Here's a sample of the errors produced on
"medium_power". I've added some line breaks to make the difference in
timestamps easier to follow.

[367622.113130] ata1.00: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[367622.113134] ata1.00: irq_stat 0x80000040, connection status changed
[367622.113136] ata1: SError: { CommWake DevExch }
[367622.113139] ata1.00: failed command: WRITE DMA EXT
[367622.113143] ata1.00: cmd 35/00:08:80:7b:0d/00:00:16:00:00/e0 tag 24 dma 4096 out
[367622.113143]          res 50/00:00:77:3f:ff/00:00:0f:00:00/ef Emask 0x10 (ATA bus error)
[367622.113145] ata1.00: status: { DRDY }
[367622.113148] ata1: hard resetting link
[367622.836250] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[367622.836665] ata1.00: unexpected _GTF length (8)
[367622.837097] ata1.00: unexpected _GTF length (8)
[367622.837103] ata1.00: configured for UDMA/33
[367622.837188] ata1: EH complete

[367668.468555] ata1.00: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[367668.468565] ata1.00: irq_stat 0x80000040, connection status changed
[367668.468570] ata1: SError: { CommWake DevExch }
[367668.468578] ata1.00: failed command: READ DMA
[367668.468588] ata1.00: cmd c8/00:08:f8:e6:e0/00:00:00:00:00/ee tag 26 dma 4096 in
[367668.468588]          res 50/00:00:a7:e1:4a/00:00:1b:00:00/e0 Emask 0x10 (ATA bus error)
[367668.468594] ata1.00: status: { DRDY }
[367668.468601] ata1: hard resetting link
[367669.192455] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[367669.192953] ata1.00: unexpected _GTF length (8)
[367669.193458] ata1.00: unexpected _GTF length (8)
[367669.193462] ata1.00: configured for UDMA/33
[367669.193568] ata1: EH complete

[367676.039388] ata1.00: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[367676.039393] ata1.00: irq_stat 0x80000040, connection status changed
[367676.039396] ata1: SError: { CommWake DevExch }
[367676.039401] ata1.00: failed command: WRITE DMA EXT
[367676.039407] ata1.00: cmd 35/00:08:20:f2:fd/00:00:15:00:00/e0 tag 28 dma 4096 out
[367676.039407]          res 50/00:00:07:e3:7d/00:00:12:00:00/e0 Emask 0x10 (ATA bus error)
[367676.039410] ata1.00: status: { DRDY }
[367676.039414] ata1: hard resetting link
[367676.762336] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[367676.762813] ata1.00: unexpected _GTF length (8)
[367676.763339] ata1.00: unexpected _GTF length (8)
[367676.763342] ata1.00: configured for UDMA/33
[367676.763497] ata1: EH complete

[368192.378495] ata1.00: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[368192.378505] ata1.00: irq_stat 0x80000040, connection status changed
[368192.378510] ata1: SError: { CommWake DevExch }
[368192.378517] ata1.00: failed command: WRITE DMA
[368192.378528] ata1.00: cmd ca/00:80:10:d9:6a/00:00:00:00:00/ee tag 15 dma 65536 out
[368192.378528]          res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA bus error)
[368192.378533] ata1.00: status: { DRDY }
[368192.378541] ata1: hard resetting link
[368193.101144] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[368193.101540] ata1.00: unexpected _GTF length (8)
[368193.101964] ata1.00: unexpected _GTF length (8)
[368193.101967] ata1.00: configured for UDMA/33
[368193.102043] ata1: EH complete

[368383.548958] ata1.00: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[368383.548963] ata1.00: irq_stat 0x80000040, connection status changed
[368383.548966] ata1: SError: { CommWake DevExch }
[368383.548969] ata1.00: failed command: WRITE DMA EXT
[368383.548973] ata1.00: cmd 35/00:98:e0:60:0f/00:00:16:00:00/e0 tag 30 dma 77824 out
[368383.548973]          res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA bus error)
[368383.548975] ata1.00: status: { DRDY }
[368383.548979] ata1: hard resetting link
[368384.270310] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[368384.270711] ata1.00: unexpected _GTF length (8)
[368384.271160] ata1.00: unexpected _GTF length (8)
[368384.271166] ata1.00: configured for UDMA/33
[368384.271246] ata1: EH complete

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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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