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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** No longer affects: linux (Ubuntu Quantal)

** No longer affects: linux (Ubuntu Precise)

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https://bugs.launchpad.net/bugs/964231

Title:
  System Stutter When HDMI/Displayport Monitor Is Connected

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  With a fresh install of Ubuntu 11.10 x64, the system has many
  "microfreezes" when I connect an external monitor via HDMI. These last
  maybe 10ms and occur about once per second. As I move my cursor around
  the screen, it stops motion during these microfreezes, causing a very
  irritating stutter effect. This only happens when using HDMI- when
  connected via VGA to an external monitor, the system behaves smoothly
  as expected. Not reproducible in Raring.

  WORKAROUND: In Quantal use kernel boot parameter
  drm_kms_helper.poll=0.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xorg 1:7.6+7ubuntu7.1
  Uname: Linux 3.3.0-030300rc7-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,grid,move,vpswitch,place,mousepoll,resize,wall,regex,session,snap,gnomecompat,imgpng,animation,expo,workarounds,unitymtgrabhandles,ezoom,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Sat Mar 24 18:30:09 2012
  DistUpgraded: Fresh install
  DistroCodename: oneiric
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Device [1b0a:2080]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: PEGATRON CORPORATION A15
  ProcEnviron:
   PATH=(cususername, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.3.0-030300rc7-generic root=UUID=a19e39dd-b510-4f9d-93f5-de6d40df10f1 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/17/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: A15
  dmi.board.vendor: PEGATRON CORPORATION
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: PEGATRON Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr211:bd06/17/2011:svnPEGATRONCORPORATION:pnA15:pvr1.0:rvnPEGATRONCORPORATION:rnA15:rvr1.0:cvnPEGATRONComputerInc.:ct9:cvr1.0:
  dmi.product.name: A15
  dmi.product.version: 1.0
  dmi.sys.vendor: PEGATRON CORPORATION
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6.1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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