Comment 0 for bug 952486

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