Update: Due a lot of testing, my best speculate is, that the Thinkpad pro dock 90 w acts as MST-DP Hub ( Display Port 1.2 Hub ) After Docking the Kernel renames DP Ports, this is needed in use with real DP 1.2 Displays. But from then ( docked in ) the resume code in DRM is not longer working ( it works if the displays are attached directly to the laptop ). So the resume bug should be somewhere in the Intel DRM / MST-DP code.
After all i found some easy workaround ( not with xrandr, cause it dont works with more the one external display ) and updated https://sys4.de/de/blog/2016/03/09/external-displays-thinkpad-pro-dock-90w-stay-switched-after-resume/ -- 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/1555078 Title: external displays thinkpad pro dock 90w stay switched after resume Status in linux package in Ubuntu: Incomplete Bug description: external-displays-thinkpad-pro-dock-90w-stay-switched-after-resume from bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530171 I 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. I vote this as a bug from the lenovo dock, contact their developers may help My Woraround solution find here https://sys4.de/de/blog/2016/03/09/external-displays-thinkpad-pro-dock-90w-stay-switched-after-resume/ --- ApportVersion: 2.20-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: rschetterer 1395 F.... pulseaudio /dev/snd/controlC0: rschetterer 1395 F.... pulseaudio DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=98d32426-2e0d-4b74-8a22-37ba6ebb8cbb MachineType: LENOVO 20BX0049GE Package: linux (not installed) ProcEnviron: LANGUAGE= TERM=xterm PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-11-generic root=UUID=91b76f4b-d581-4589-bbfd-3057220745e3 ro splash quiet vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.4.0-11-generic N/A linux-backports-modules-4.4.0-11-generic N/A linux-firmware 1.156 Tags: xenial Uname: Linux 4.4.0-11-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 12/23/2015 dmi.bios.vendor: LENOVO dmi.bios.version: JBET55WW (1.20 ) dmi.board.asset.tag: Not Available dmi.board.name: 20BX0049GE dmi.board.vendor: LENOVO dmi.board.version: SDK0J40705 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrJBET55WW(1.20):bd12/23/2015:svnLENOVO:pn20BX0049GE:pvrThinkPadT450s:rvnLENOVO:rn20BX0049GE:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20BX0049GE dmi.product.version: ThinkPad T450s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1555078/+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
