I've got the nvidia proprietary drivers setup now and it makes no difference. Running:
$ optirun lxrandr has the same effec, i.e. no external screens shown in the list, as running the normal $ lxrandr -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1292036 Title: Displayport on Thinkpad T420s is not usable Status in linux package in Ubuntu: Incomplete Bug description: Hi, I'm trying to connect an external screen to my thinkpad T420s. I'm running Ubuntu 14.04 and here is the output of xrandr: $ xrandr Screen 0: minimum 320 x 200, current 1600 x 900, maximum 32767 x 32767 LVDS1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm 1600x900 60.0*+ 40.0 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) VIRTUAL1 disconnected (normal left inverted right x axis y axis) LVDS1 is the LCD-display on the laptop. This is the output of lspci: $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [NVS 4200M] (rev ff) The screen recognises that something is plugged into the DisplayPort but Ubuntu is unable to send output to it. It's probably related to the whole dual graphics card thing. Thank you for reading this bug! ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xorg 1:7.7+1ubuntu8 ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5 Uname: Linux 3.13.0-16-generic i686 ApportVersion: 2.13.3-0ubuntu1 Architecture: i386 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: None Date: Thu Mar 13 15:32:36 2014 DistUpgraded: 2014-02-24 23:10:48,392 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu EcryptfsInUse: Yes ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:21d3] NVIDIA Corporation GF119M [NVS 4200M] [10de:1056] (rev ff) (prog-if ff) InstallationDate: Installed on 2013-08-07 (217 days ago) InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213) MachineType: LENOVO 4174PEG ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=sv_SE.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-16-generic root=UUID=7d44dac8-470f-4bb6-a331-e31a6e61ea51 ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: Upgraded to trusty on 2014-02-24 (16 days ago) dmi.bios.date: 11/01/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 8CET50WW (1.30 ) dmi.board.asset.tag: Not Available dmi.board.name: 4174PEG 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:bvr8CET50WW(1.30):bd11/01/2011:svnLENOVO:pn4174PEG:pvrThinkPadT420s:rvnLENOVO:rn4174PEG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4174PEG dmi.product.version: ThinkPad T420s dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.11+14.04.20140305-0ubuntu1 version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0~rc3-0ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0~rc3-0ubuntu3 version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Thu Mar 13 14:44:03 2014 xserver.configfile: default xserver.errors: Failed to load module "nvidia" (module does not exist, 0) xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 8510 vendor AUO xserver.version: 2:1.15.0-1ubuntu6 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1292036/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
