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[Ms-l <1275794@xxxxxxxxxxxxxxxxxx>]

So, to my understanding MST is not supported meaning that multiple (DP)
connected monitors will become mirrored. However, it seems like also the
DVI output is mirrored - is this expected?

I am running Ubuntu 14.04 (i.e. 3.13.0-24-generic) on a T440p attached
to an ultra dock (firmware 2.17), and attaching one DP monitor works
flawlessly together with the builtin display. However attaching an
additional monitor (occurs for both DP and DVI) simply mirrors the first
DP connected display. xrandr outputs the same in either case:

martin@martin-ThinkPad-T440p:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
   1600x900       60.0 +
   1440x900       59.9  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200      60.0*+
   3840x1200      60.0  
   2560x1024      60.0  
   1920x1080      60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x800       59.8  
   1280x720       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  
   720x400        70.1  
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I would expect the DVI port to be working independently of the DP port -
is this  not the case?

thanks,
Martin

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https://bugs.launchpad.net/bugs/1275794

Title:
  Lenovo T440s freezes when connected to docking station

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  This bug report looks to be for the same issue:
  https://bugs.freedesktop.org/show_bug.cgi?id=71267

  I came across the above bug report here:
  https://bbs.archlinux.org/viewtopic.php?pid=1374408

  I'm running with a Thinkpad T440s and ultra dock with hdmi<->hdmi.  In
  my case if I dock when hdmi is connected to the dock, the mouse and
  keyboard freeze once connected.  When I undock they unfreeze.  If I
  dock when hdmi is not connected to the dock, the mouse and keyboard
  don't freeze.

  Ubuntu release: 14.04 Trusty Tahr (development branch)
  --- 
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  corey      2385 F.... pulseaudio
   /dev/snd/controlC0:  corey      2385 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=12d1435c-d652-4aab-8da6-3b043f3da722
  InstallationDate: Installed on 2014-01-31 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
  MachineType: LENOVO 20AQCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-5-generic.efi.signed root=UUID=d17999de-2672-48e5-b628-403d311d3251 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-5-generic N/A
   linux-backports-modules-3.13.0-5-generic  N/A
   linux-firmware                            1.123
  Tags:  trusty
  Uname: Linux 3.13.0-5-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip kvm libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/10/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET67WW (2.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET67WW(2.17):bd12/10/2013:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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