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[Maciej Pawlik <maciej.pawlik.xml@xxxxxxxxx>]

Hey,

I did a bisection on my lenovo W500 (almost same hardware as T500) and it turns out that the bug was introduced in 2.6.37-2.9 natty kernel, and made it's way back to maverick with  2.6.38-10.44 update. After that I bisected a vanilla kernel, and it turns out that the offending commit is: [ba032a58d1f320039e7850fb6e8651695c1aa571] drm/radeon/kms: rework spread spectrum handling
so it is a bug with spread spectrum handling on displayport. This feature was disabled on DP and HDMI prior to that commit.


It seems that this is already reported to radeon/kernel guys here:
https://bugs.freedesktop.org/show_bug.cgi?id=40699
I'm gonna provide more details there.

** Bug watch added: freedesktop.org Bugzilla #40699
   https://bugs.freedesktop.org/show_bug.cgi?id=40699

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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."

  WORKAROUND: Installing fglrx-legacy 8.97.100.7 on Ubuntu 13.04 solves
  the problem.

  The GNOME display settings dialog shows exactly 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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