I am tested wily ,xenial, kubuntu, kernels 4.2 , 4.4 on brand new thinkpad t450s with thinkpad pro dock 90w. The laptop and the dock has latest fimware ! Intel graphics driver is at latest state too. Also tested latest 4.5 drm intel nightly. All external displays work always when directly attached to the laptop. But with laptop docked, external displays are only running after boot, but fail when wake up from sleep mode configured in kde closing lid. This is a very common user powersetting an is awaited to work. Most of the times external displays could reconfigured i.e by script produced from arandr ( gtk gui wrapper for xrandr ). But a universal script workaround seems complicated with acpi, systemd in userland for all thinkable combinations of possible displays ( up to three include lcd on laptop are possible).
It should simply work out of the box. Additional info i invested a lot of time in kernel logs and trying grub start parameter, cause there were other ugly bug with intel 915 driver ( pci lied SDE etc fixed in 4.5 ) , there is also a point in the bios configure 10s to wait for notice external displays. Also 2014 the dock had a bug ( also on windows with external displays which was fixed by new firmware ). It seems simply the dock does not pass external displays connected after laptop and external displays got sleep mode after wake up, prove is made by plug/unplugging external display and reenable it in kde. Also open windows were only reconstructed after awake with kernel 4.4 /4.5 after manual reenable, with kernel 4.2 most of the time also plasma crashes and simply undock crash x-server too. Any idea what to look next ? Regards -- 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/1530171 Title: [Regression] Thinkpad dock: External monitors not recognized after 15.04 upgrade Status in linux package in Ubuntu: Incomplete Bug description: External monitors are not recognized in display settings when plugged into any dock port. They *are* recognized after a reboot (not after logout). After plugging out and the in again they are not recognized. A monitor plugged in and out of the non-dock VGA is recognized instantly. After plugging in or out of the non-dock VGA, monitors plugged to dock ports are recognized (which serves as a crazy workaround for me now) (update: this works sometimes, sometimes not). Everything used to work with 14.10, but stopped with 15.04. A recent test with 1510 live CD did not fix this. --- .tmp.unity.support.test.0: ApportVersion: 2.17.2-0ubuntu1.8 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 DistUpgraded: 2016-01-04 01:09:49,649 DEBUG enabling apt cron job DistroCodename: vivid DistroRelease: Ubuntu 15.04 DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:501e] InstallationDate: Installed on 2015-03-05 (311 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) MachineType: LENOVO 20AUS00N00 Package: xorg 1:7.7+7ubuntu4 PackageArchitecture: amd64 ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.19.0-43-generic root=UUID=82cd15d9-7510-4d2f-a698-28fa51216e13 ro rootflags=subvol=@ quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.19.0-43.49-generic 3.19.8-ckt10 Tags: vivid ubuntu compiz-0.9 Uname: Linux 3.19.0-43-generic x86_64 UpgradeStatus: Upgraded to vivid on 2016-01-04 (6 days ago) UserGroups: adm cdrom dip lp lpadmin plugdev sambashare saned sudo _MarkForUpload: True dmi.bios.date: 08/13/2014 dmi.bios.vendor: LENOVO dmi.bios.version: J4ET67WW(1.67) dmi.board.asset.tag: Not Available dmi.board.name: 20AUS00N00 dmi.board.vendor: LENOVO dmi.board.version: NO DPK dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrJ4ET67WW(1.67):bd08/13/2014:svnLENOVO:pn20AUS00N00:pvrThinkPadL540:rvnLENOVO:rn20AUS00N00:rvrNODPK:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20AUS00N00 dmi.product.version: ThinkPad L540 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.12.1+15.04.20150922-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.60-2 version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2 version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1 xserver.bootTime: Wed Jan 6 15:29:10 2016 xserver.configfile: default xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 5568 vendor CMN xserver.version: 2:1.17.1-0ubuntu3.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530171/+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
