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[John Hunt <610055@xxxxxxxxxxxxxxxxxx>]

Hello,

I seem to recall this was a hardware fault in my case therefore for me it's
OK to close this bug.

Thanks,
John

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https://bugs.launchpad.net/bugs/610055

Title:
  [Dell Latitude E6400] system stutters, freezes, hangs, gratuitous
  'Commit=0' errors

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I'm not sure if this should be one bug report or many, and I don't have much info to put in here.
  My computer is stuttering (doing small one-second freeze, similar to a OOM but it's not that), freezing (mouse and keyboard lock up, but wifi still blinks) and hanging completely (although this might be the same as the latter, because it happens when I open the lid - not a suspend/resume cycle, just closing the lid while on AC, opening it, blank screen and no activity).
  There is very little in the logs. The stuttering happens at random times, but especially when plugging in AC, at which point I get a SATA error in the logs, something like:
  Jul 21 10:54:31 hulla kernel: [ 5913.787813] ata6: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
  Jul 21 10:54:31 hulla kernel: [ 5913.787823] ata6: irq_stat 0x00000040, connection status changed
  Jul 21 10:54:31 hulla kernel: [ 5913.787831] ata6: SError: { CommWake DevExch }
  Jul 21 10:54:31 hulla kernel: [ 5913.787845] ata6: hard resetting link
  Jul 21 10:54:41 hulla kernel: [ 5923.792597] ata6: softreset failed (device not ready)
  Jul 21 10:54:41 hulla kernel: [ 5923.792609] ata6: hard resetting link
  setting /sys/class/scsi_host/host1/link_power_management_policy to min_power stops the stuttering once it's started, and turning off IRRT seems to have gotten rid of them (but the system is slower as a result).
  I also get something similar almost every day, right after cron finishes,
  Jul 24 15:57:10 hulla anacron[15536]: Normal exit (0 jobs run)
  Jul 24 15:57:10 hulla kernel: [60453.149759] ata1.00: configured for UDMA/133
  Jul 24 15:57:10 hulla kernel: [60453.149763] ata1: EH complete
  Jul 24 15:57:10 hulla kernel: [60453.149847] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  Jul 24 15:57:10 hulla kernel: [60453.240632] EXT4-fs (dm-0): re-mounted. Opts: errors=remount-ro,commit=0
  Jul 24 15:57:10 hulla kernel: [60453.282743] EXT4-fs (sda1): re-mounted. Opts: commit=0
  Jul 24 15:57:11 hulla kernel: [60453.456970] ata2: exception Emask 0x10 SAct 0x0 SErr 0x50000 action 0xe frozen
  Jul 24 15:57:11 hulla kernel: [60453.456980] ata2: irq_stat 0x00400000, PHY RDY changed
  Jul 24 15:57:11 hulla kernel: [60453.456988] ata2: SError: { PHYRdyChg CommWake }
  Jul 24 15:57:11 hulla kernel: [60453.457000] ata2: hard resetting link
  Jul 24 15:57:12 hulla kernel: [60454.382582] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
  Jul 24 15:57:12 hulla kernel: [60454.422044] ata2.00: configured for UDMA/100
  Jul 24 15:57:12 hulla kernel: [60454.423791] ata2: EH complete
  Jul 24 15:57:31 hulla kernel: [60473.892676] usbcore: deregistering interface driver option
  Jul 24 15:57:31 hulla kernel: [60473.892765] USB Serial deregistering driver GSM modem (1-port)
  Jul 24 15:57:31 hulla kernel: [60473.952548] usbcore: deregistering interface driver usbserial_generic
  Jul 24 15:57:31 hulla kernel: [60473.953014] USB Serial deregistering driver generic
  but I'm not sure it's the same thing.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-10-generic 2.6.35-10.15
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.35-10.15-generic 2.6.35-rc5
  Uname: Linux 2.6.35-10-generic x86_64
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: aplay: device_list:235: no soundcards found...
  Architecture: amd64
  ArecordDevices: arecord: device_list:235: no soundcards found...
  Date: Mon Jul 26 09:07:17 2010
  Frequency: Once a day.
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100224.1)
  MachineType: Dell Inc. Latitude E6400
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-10-generic root=/dev/mapper/hostname ro crashkernel=384M-2G:64M,2G-:128M quiet splash
  ProcEnviron:
   LANGUAGE=en_GB:en_US:en
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: linux
  dmi.bios.date: 10/30/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A19
  dmi.board.name: 0U692R
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA19:bd10/30/2009:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn0U692R:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6400
  dmi.sys.vendor: Dell Inc.

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