Kai Mast, thank you for reporting this and helping make Ubuntu better. As per http://support.lenovo.com/us/en/products/Laptops-and- netbooks/ThinkPad-T-Series-laptops/ThinkPad- T440s?linkTrack=GPS:Body_Search%20Products&beta=false an update to your computer's buggy, insecure, and outdated BIOS is available (2.37). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?
For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note, your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. Also, you don't have to create a new bug report. Once the BIOS is updated, if the problem is still reproducible: 1) Please provide the output of the following terminal command (not perform an apport-collect): sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date 2) Please make a comment specifically advising on if there was an improvement or not. 3) Please mark this report Status New. If it's not reproducible, please mark this as Invalid. Thank you for your understanding. ** Tags added: bios-outdated-2.37 ** Changed in: xserver-xorg-video-intel (Ubuntu) Importance: Undecided => Low ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1552040 Title: Laptop sometimes doesn't detect external monitor Status in xserver-xorg-video-intel package in Ubuntu: Incomplete Bug description: Usually a reboot fixes the problem. I see stuff like this in dmesg. [15294.887642] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15295.568309] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15295.587193] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15296.267547] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15296.286426] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15296.886015] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15296.886264] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* failed to train DP, aborting [15296.898472] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* Timed out waiting for DP idle patterns [15296.899688] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15297.579305] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15297.598328] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15298.279238] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15298.298275] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15298.965500] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15298.984539] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15299.665619] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15299.684522] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15300.367119] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15300.386173] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15301.067203] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15301.086097] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit [15301.768998] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [15301.769703] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* failed to train DP, aborting [15301.781947] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* Timed out waiting for DP idle patterns ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2 Uname: Linux 4.4.0-8-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.20-0ubuntu3 Architecture: amd64 BootLog: [[0;32m OK [0m] Started LSB: Speech Dispatcher. 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: Tue Mar 1 20:58:27 2016 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:220c] InstallationDate: Installed on 2016-02-26 (5 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224) MachineType: LENOVO 20AQS00500 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic root=UUID=bb8da1f1-8970-435e-aeaf-d7e1d9aa8a4e ro quiet splash vt.handoff=7 SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/21/2015 dmi.bios.vendor: LENOVO dmi.bios.version: GJET85WW (2.35 ) dmi.board.asset.tag: Not Available dmi.board.name: 20AQS00500 dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGJET85WW(2.35):bd09/21/2015:svnLENOVO:pn20AQS00500:pvrThinkPadT440s:rvnLENOVO:rn20AQS00500:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20AQS00500 dmi.product.version: ThinkPad T440s dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.12.2+16.04.20160209-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1 xserver.bootTime: Tue Mar 1 12:11:39 2016 xserver.configfile: default xserver.errors: systemd-logind: failed to get session: PID 832 does not belong to any known session xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 12350 vendor AUO xserver.version: 2:1.17.3-2ubuntu4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1552040/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
