Dual monitor DisplayPort stopped working.

[Julius Thor]

After I updated today using Update-Manager I can no longer use my secondary monitor which is connected via DisplayPort. This was a problem a few months ago and it seems to have creeped back into ubuntu? I used to use VGA while this was a problem and I have reverted back to that workaround. The image is considerably worse so I hope whatever broke the DisplayPort code gets reverted back.

This is what got upgraded:

Start-Date: 2012-05-14 09:25:47
Commandline: aptdaemon role='role-commit-packages' sender=':1.81'
Upgrade: libreoffice-help-en-gb:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libreoffice-gnome:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), unity:amd64 (5.10.0-0ubuntu6, 5.12-0ubuntu1), hdparm:amd64 (9.37-0ubuntu3, 9.37-0ubuntu3.1), libreoffice-draw:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libreoffice-help-en-us:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), unity-2d:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), unity-2d-common:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), compiz-plugins-default:amd64 (0.9.7.6-0ubuntu1, 0.9.7.8-0ubuntu1), libebackend-1.2-1:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), libatspi2.0-0:amd64 (2.4.0-1, 2.4.1-0ubuntu0.1), libreoffice-style-tango:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libreoffice-impress:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), at-spi2-core:amd64 (2.4.0-1, 2.4.1-0ubuntu0.1), libgtkhtml-4.0-common:amd64 (4.2.2-1ubuntu1, 4.2.2-1ubuntu1.1), zenity:amd64 (3.4.0-0ubuntu2, 3.4.0-0ubuntu4), libunity-2d-private0:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), ubufox:amd64 (2.0.2-0ubuntu1, 2.0.3-0ubuntu1), fonts-opensymbol:amd64 (102.2+LibO3.5.2-2ubuntu1, 102.2+LibO3.5.3-0ubuntu1), gnome-settings-daemon:amd64 (3.4.1-0ubuntu1, 3.4.1-0ubuntu1.1), unity-scope-musicstores:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), unity-common:amd64 (5.10.0-0ubuntu6, 5.12-0ubuntu1), libnm-util2:amd64 (0.9.4.0-0ubuntu3, 0.9.4.0-0ubuntu4), ttf-opensymbol:amd64 (102.2+LibO3.5.2-2ubuntu1, 102.2+LibO3.5.3-0ubuntu1), libgtkhtml-4.0-0:amd64 (4.2.2-1ubuntu1, 4.2.2-1ubuntu1.1), libedata-book-1.2-11:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), unity-lens-music:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), unity-2d-spread:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), libreoffice-math:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libedata-cal-1.2-13:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), unity-2d-panel:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), libreoffice-gtk:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libreoffice-common:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), simple-scan:amd64 (3.4.1-0ubuntu1, 3.4.1-0ubuntu1.1), libgtkhtml-editor-4.0-0:amd64 (4.2.2-1ubuntu1, 4.2.2-1ubuntu1.1), uno-libs3:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), network-manager:amd64 (0.9.4.0-0ubuntu3, 0.9.4.0-0ubuntu4), libnm-glib-vpn1:amd64 (0.9.4.0-0ubuntu3, 0.9.4.0-0ubuntu4), python-uno:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), sudo:amd64 (1.8.3p1-1ubuntu3, 1.8.3p1-1ubuntu3.1), libnm-glib4:amd64 (0.9.4.0-0ubuntu3, 0.9.4.0-0ubuntu4), libunity-core-5.0-5:amd64 (5.10.0-0ubuntu6, 5.12-0ubuntu1), libedataserver-1.2-15:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), libebook-1.2-12:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), compiz-gnome:amd64 (0.9.7.6-0ubuntu1, 0.9.7.8-0ubuntu1), gir1.2-atspi-2.0:amd64 (2.4.0-1, 2.4.1-0ubuntu0.1), libcamel-1.2-29:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), libecal-1.2-10:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), unity-2d-shell:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), unity-services:amd64 (5.10.0-0ubuntu6, 5.12-0ubuntu1), xul-ext-ubufox:amd64 (2.0.2-0ubuntu1, 2.0.3-0ubuntu1), libreoffice-style-human:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), compiz-plugins:amd64 (0.9.7.6-0ubuntu1, 0.9.7.8-0ubuntu1), ure:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), unity-2d-places:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), libdecoration0:amd64 (0.9.7.6-0ubuntu1, 0.9.7.8-0ubuntu1), libreoffice-base-core:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), zenity-common:amd64 (3.4.0-0ubuntu2, 3.4.0-0ubuntu4), libreoffice-calc:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), gir1.2-networkmanager-1.0:amd64 (0.9.4.0-0ubuntu3, 0.9.4.0-0ubuntu4), evolution-data-server-common:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), evolution-data-server:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), libreoffice-emailmerge:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), compiz:amd64 (0.9.7.6-0ubuntu1, 0.9.7.8-0ubuntu1), unity-lens-applications:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), compiz-core:amd64 (0.9.7.6-0ubuntu1, 0.9.7.8-0ubuntu1), libedataserverui-3.0-1:amd64 (3.2.3-0ubuntu6, 3.2.3-0ubuntu7), libreoffice-l10n-en-gb:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), unity-2d-launcher:amd64 (5.10.0-0ubuntu1, 5.12.0-0ubuntu1), libreoffice-core:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libreoffice-writer:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1), libreoffice-l10n-en-za:amd64 (3.5.2-2ubuntu1, 3.5.3-0ubuntu1)
End-Date: 2012-05-14 09:29:18

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Mon May 14 13:42:49 2012
DistUpgraded: 2012-03-03 00:53:17,731 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.12, 3.2.0-20-generic, x86_64: installed
 virtualbox, 4.1.12, 3.2.0-22-generic, x86_64: installed
 virtualbox, 4.1.12, 3.2.0-23-generic, x86_64: installed
 virtualbox, 4.1.12, 3.2.0-24-generic, x86_64: installed
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 NVIDIA Corporation GT216 [Quadro FX 880M] [10de:0a3c] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:2145]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: LENOVO 4389W6L
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic root=UUID=985bf469-57fc-48df-a8a4-5d25c912a427 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to precise on 2012-03-03 (72 days ago)
dmi.bios.date: 11/29/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 6NET80WW (1.41 )
dmi.board.name: 4389W6L
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:bvr6NET80WW(1.41):bd11/29/2011:svnLENOVO:pn4389W6L:pvrThinkPadW510:rvnLENOVO:rn4389W6L:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4389W6L
dmi.product.version: ThinkPad W510
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.7.8-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu35
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Julius Thor (joolli)]

Note: The monitor was plugged in while I made this bug report. xrandr.txt still says it's disconnected.

[Julius Thor (joolli)]

Tried DisplayPort again today and this problem still persists. I did make another test, however:

I can get DisplayPort working if I boot the computer docked and DisplayPort plugged into the dock. If i then undock the computer and redock, DisplayPort will not activate again and xrandr shows no indication of a Monitor being connected to any of the DisplayPorts.

[Julius Thor (joolli)]

Just docked my laptop and woke it up from sleep and it detected the two monitors.

This was either fixed in the latest kernel or after I disabled polling in drm_kms_helper:

echo N > /sys/module/drm_kms_helper/parameters/poll

I put it into /etc/rc.local to make it permanent.