Public bug reported: Summary: On my dual screen setup, the external monitor doesn't work in X after the latest update.
Tested this with the external monitor connected via VGA a) using docking station b) using X200s internal VGA output Booting up ubuntu works just normal. The boot screen and login prompt is mirrored on the internal and external monitors. So it does work technically and the cabling is correct. After logging in, X kicks in and the external monitor goes blank. System settings however shows the external monitor with correct dimensions. Hitting "recognize screen" doesn't help. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xorg 1:7.7+1ubuntu8.1 ProcVersionSignature: Ubuntu 4.4.0-89.112~14.04.1-generic 4.4.76 Uname: Linux 4.4.0-89-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3.29 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Sat Aug 25 10:48:22 2018 DistUpgraded: 2017-05-13 08:46:45,733 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:20e4] Subsystem: Lenovo Device [17aa:20e4] InstallationDate: Installed on 2015-03-03 (1270 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) MachineType: LENOVO 7458WPW ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-89-generic root=UUID=98fb4872-8b98-469b-9c96-acbc8e4eba17 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to trusty on 2017-05-13 (469 days ago) dmi.bios.date: 10/25/2012 dmi.bios.vendor: LENOVO dmi.bios.version: 6DET72WW (3.22 ) dmi.board.name: 7458WPW 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:bvr6DET72WW(3.22):bd10/25/2012:svnLENOVO:pn7458WPW:pvrThinkPadX200:rvnLENOVO:rn7458WPW:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 7458WPW dmi.product.version: ThinkPad X200 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.11.3+14.04.20160425-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1ubuntu0.14.04.2 version.libgl1-mesa-dri: libgl1-mesa-dri N/A version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core N/A version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A xserver.bootTime: Fri Aug 24 23:09:28 2018 xserver.configfile: default xserver.errors: intel(0): sna_mode_shutdown_crtc: invalid state found on pipe 1, disabling CRTC:29 xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 16400 vendor LEN xserver.version: 2:1.18.4-0ubuntu0.2~trusty2 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 trusty ubuntu -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1788991 Title: external screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1788991/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp