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[Géza Búza <952486@xxxxxxxxxxxxxxxxxx>]

Yes, installing the proprietary AMD fglrx driver solves this problem.
That's why I am currently using fglrx-legacy 8.97.100.7 on Ubuntu 13.04.

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https://bugs.launchpad.net/bugs/952486

Title:
  1002:9591 [Lenovo ThinkPad T500] External monitor on display port has
  no sync with radeon driver

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  When I turn on the external monitor, it displays an error message:
  "The current input timing is not supported by the monitor display.
  Please change your input timing to 1920x1080@60Hz or any other monitor listed timing as per the monitor specifications."

  The GNOME display settings dialog shows exacty this recommended setting as current.
  I even tried to set it up using xrand with:
  $ xrandr --output DisplayPort-0 --auto -s 24/1920x1080 -r 60

  $ xrandr -q
  Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 8192 x 8192
  DVI-0 unknown connection (normal left inverted right x axis y axis)
     1360x768       59.8  
     1152x864       60.0  
     1024x768       60.0  
     800x600        60.3  
     640x480        59.9  
     680x384       119.6    119.9  
     576x432       120.1  
     512x384       120.0  
     400x300       120.6  
     320x240       120.1  
  LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm
     1280x800       60.0*+   50.1  
     1280x720       59.9  
     1152x768       59.8  
     1024x768       59.9  
     800x600        59.9  
     848x480        59.7  
     720x480        59.7  
     640x480        59.4  
  DisplayPort-0 connected 1920x1080+1280+0 (normal left inverted right x axis y axis) 509mm x 286mm
     1920x1080      60.0*+
     1280x1024      75.0     60.0  
     1152x864       75.0  
     1024x768       75.1     60.0  
     800x600        75.0     60.3  
     640x480        75.0     60.0  
     720x400        70.1  
  VGA-0 disconnected (normal left inverted right x axis y axis)

  External monitor is a Dell U2311H unit.

  I have found a similar bug like this:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/838181

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-18-generic 3.2.0-18.29
  ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
  Uname: Linux 3.2.0-18-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 1.94.1-0ubuntu2
  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:  geza       2080 F.... pulseaudio
  CRDA:
   country HU:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfc220000 irq 50'
     Mixer name	: 'Conexant CX20561 (Hermosa)'
     Components	: 'HDA:14f15051,17aa2100,00100000 HDA:14f12c06,17aa2122,00100000'
     Controls      : 17
     Simple ctrls  : 12
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7VHT16WW-1.06'
     Mixer name	: 'ThinkPad EC 7VHT16WW-1.06'
     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 11 20:15:41 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  MachineType: LENOVO 2081CTO
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   LANG=hu_HU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=540742bc-9ee9-4c77-8e80-91f88cc9f368 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-18-generic N/A
   linux-backports-modules-3.2.0-18-generic  N/A
   linux-firmware                            1.71
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/14/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6FET92WW (3.22 )
  dmi.board.name: 2081CTO
  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:bvr6FET92WW(3.22):bd12/14/2011:svnLENOVO:pn2081CTO:pvrThinkPadT500:rvnLENOVO:rn2081CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2081CTO
  dmi.product.version: ThinkPad T500
  dmi.sys.vendor: LENOVO

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