This issue affects me as well. Lenovo T460 and a Lenovo basic docking station. The docking station is connected to an Acer 24" monitor via VGA. Once the desktop locks and the unity login appears the external display enters power save mode. Unlocking via the password does not power up the external display (all windows are moved to laptop display). I have to eject the laptop from the dock, wait a couple of seconds, then put the laptop back in the dock for the external display to power back up. I'd prefer not to physically undock/dock the laptop several times a day.
-- 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/1189639 Title: [dp] External Screen doesn't wake up from sleep Status in linux package in Ubuntu: Incomplete Bug description: I have a Lenovo X1 Carbon with an external screen connected to a Mini DP to VGA adapter. External screen works fine until the display goes to sleep for inactivity (just the display goes to sleep, not the laptop). When I return to the laptop, the built in screen wakes but the external screen does not. The screen is still detected, xrandr displays the resolution and I can move the cursor to the external display but the display remains off. I have tried cycling with Fn+F7 and also tried Ctrl+Alt+F1 then Ctrl+Alt+F7. The only way to get the external display back on is by disconnecting the adapter from the laptops DP port and reconnecting. dmesg produces: drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting Running Description: Ubuntu 13.04 Release: 13.04 kernel 3.8.0-23-generic xserver-xorg-video-intel: Installed: 2:2.21.6-0ubuntu4 As a workaround I have disabled the monitor from sleeping in System Settings->Brightness & Lock-> Turn Screen off when inactive for --- ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: omri 2408 F.... pulseaudio omri 8582 F.... TeamViewer.exe /dev/snd/pcmC0D0p: omri 2408 F...m pulseaudio DistroRelease: Ubuntu 13.10 HibernationDevice: RESUME=UUID=d46a5b01-0285-4289-8345-692997c83409 InstallationDate: Installed on 2013-10-19 (80 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: LENOVO 3443CTO MarkForUpload: True Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-15-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 RelatedPackageVersions: linux-restricted-modules-3.11.0-15-generic N/A linux-backports-modules-3.11.0-15-generic N/A linux-firmware 1.116 Tags: saucy Uname: Linux 3.11.0-15-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm bluetooth cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 04/29/2013 dmi.bios.vendor: LENOVO dmi.bios.version: G6ET96WW (2.56 ) dmi.board.asset.tag: Not Available dmi.board.name: 3443CTO dmi.board.vendor: LENOVO dmi.board.version: Win8 Pro DPK TPG dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG6ET96WW(2.56):bd04/29/2013:svnLENOVO:pn3443CTO:pvrThinkPadX1Carbon:rvnLENOVO:rn3443CTO:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 3443CTO dmi.product.version: ThinkPad X1 Carbon dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1189639/+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
