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[Steve Langasek <steve.langasek@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Fix Released => Incomplete

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https://bugs.launchpad.net/bugs/743907

Title:
  Performance degradation after resume

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Resuming after a suspend results in much degraded system performance
  and strange use of processor resources (according to top, htop, system
  monitor, and similar).

  Suspend works fine. After resume, behavior is sluggish and jumpy.
  Looking at top (and similar programs) shows that an apparently random
  process is using an entire core. When I kill that process, another
  apparently random process takes its place, and occupies 100% use of a
  whole core, even when that process apparently shouldn't be doing
  anything at all, and doesn't ever use that much processor time during
  normal operation. No matter how many processes I kill, there is always
  one sucking up a whole core. Processes that have exhibited this
  behavior include gnome-panel, chromium-browser, nautilus, gnome-
  terminal, bash, Xorg, and others. Again, this consumption of excessive
  processor time and whole-system performance degradation happens only
  after a resume.

  This is a bug that started in kernel version 2.6.32-26, and continues
  in 2.6.32-27, 2.6.32-28, 2.6.32-29, and 2.6.32-30. It does NOT occur
  in 2.6.32-25, and so I consider it a regression.

  This is easily reproducible on my Core 2 Quad notebook running up-to-
  date Lucid.

  I don't know what's causing this. Please let me know what information
  I can collect for you.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-25-generic 2.6.32-25.45
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
  Uname: Linux 2.6.32-25-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  eppie      1692 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfc220000 irq 17'
     Mixer name	: 'Conexant CX20561 (Hermosa)'
     Components	: 'HDA:14f15051,17aa211d,00100000'
     Controls      : 14
     Simple ctrls  : 7
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7ZHT24WW-1.07'
     Mixer name	: 'ThinkPad EC 7ZHT24WW-1.07'
     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: Sun Mar 27 23:18:25 2011
  HibernationDevice: RESUME=UUID=0157a8b3-c77f-4c15-9b30-44ae99dc1d9a
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  MachineType: LENOVO 2757CTO
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-25-generic root=UUID=f86cd16c-e2b3-45a7-9905-8b1b5ac28f69 ro quiet splash
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34.4
  SourcePackage: linux
  dmi.bios.date: 08/30/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7ZETB3WW (2.13 )
  dmi.board.name: 2757CTO
  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:bvr7ZETB3WW(2.13):bd08/30/2010:svnLENOVO:pn2757CTO:pvrThinkPadW700:rvnLENOVO:rn2757CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2757CTO
  dmi.product.version: ThinkPad W700
  dmi.sys.vendor: LENOVO

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