Tom Holy, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
ati/+bug/570011/comments/24 regarding this being fixed with an update.
For future reference you can manage the status of your own bugs by
clicking on the current status in the yellow line and then choosing a
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Please submit any future bugs you may find.

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/570011

Title:
  Modesetting fails if large screen monitor attached at boot

Status in “xserver-xorg-video-ati” package in Ubuntu:
  Invalid

Bug description:
  I have a Thinkpad T60. If I boot from the RC1 live CD, graphical
  modesetting seems to work well if the external monitor is not
  connected at boot time. If I then plug in the monitor, I can then
  switch to a new resolution (1920x1080) from the old resolution
  (1400x1050). Switching back and forth multiple times seems to work
  well, in the 10 minutes I've been playing with the system.

  However, if I boot with the monitor connected, then the resolution is
  set to 1024x768 on both screens, and when I try to set the resolution
  to something more useful, eventually the entire screen starts
  flickering with weird horizontal lines on the laptop's monitor, and
  the external monitor display wiggles around rapidly. The display is
  not usable under such circumstances. External monitor: Dell S2409W

  Apparent workaround: boot with monitor disconnected, and then after
  logging in, connect the external monitor.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-21-generic 2.6.32-21.32
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-21-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     3084 F.... knotify4
                        ubuntu     3127 F.... kmix
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xee400000 irq 17'
     Mixer name : 'Analog Devices AD1981'
     Components : 'HDA:11d41981,17aa2025,00100200'
     Controls      : 20
     Simple ctrls  : 11
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 
79HT43WW-1.02'
     Mixer name : 'ThinkPad EC 79HT43WW-1.02'
     Components : ''
     Controls      : 2
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
     Playback channels: Mono
     Limits: Playback 0 - 14
     Mono: Playback 14 [100%] [on]
  Date: Sun Apr 25 22:11:40 2010
  HotplugNewDevices:
   
  HotplugNewMounts:
   
  LiveMediaBuild: Kubuntu 10.04 "Lucid Lynx" - Release Candidate i386 
(20100419.1)
  MachineType: LENOVO 2623D7U
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/khostname.seed 
boot=casper initrd=/casper/initrd.lz quiet splash --
  ProcEnviron:
   LANGUAGE=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34
  SourcePackage: linux
  Symptom: storage
  UdevMonitorLog:
   monitor will print the received events for:
   UDEV - the event which udev sends out after rule processing
  UdisksMonitorLog: Monitoring activity from the disks daemon. Press Ctrl+C to 
cancel.
  dmi.bios.date: 04/18/2006
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 79ET60WW (1.05a)
  dmi.board.name: 2623D7U
  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:bvr79ET60WW(1.05a):bd04/18/2006:svnLENOVO:pn2623D7U:pvrThinkPadT60:rvnLENOVO:rn2623D7U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2623D7U
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO
  --- 
  Architecture: i386
  DistroRelease: Ubuntu 10.04
  DkmsStatus: Error: [Errno 2] No such file or directory
  LiveMediaBuild: Kubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427)
  MachineType: LENOVO 2623D7U
  Package: xorg 1:7.5+5ubuntu1
  PackageArchitecture: i386
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/khostname.seed 
boot=casper initrd=/casper/initrd.lz quiet splash --
  ProcEnviron:
   LANGUAGE=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
  Tags: lucid lucid
  Uname: Linux 2.6.32-21-generic i686
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 04/18/2006
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 79ET60WW (1.05a)
  dmi.board.name: 2623D7U
  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:bvr79ET60WW(1.05a):bd04/18/2006:svnLENOVO:pn2623D7U:pvrThinkPadT60:rvnLENOVO:rn2623D7U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2623D7U
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO
  glxinfo: Error: [Errno 2] No such file or directory
  system:
   distro:             Ubuntu
   codename:           lucid
   architecture:       i686
   kernel:             2.6.32-21-generic

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