I should have added, on the Lenovo the cable goes straight into the notebook (it has an HDMI port) while with the XPS 13 I need to use a Thunderbold adapter for attaching the HDMI cable.
-- 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/1763202 Title: Lenovo X1 Carbon 6th Gen. HDMI not working for external monitor Status in linux package in Ubuntu: Incomplete Bug description: I have an X1 Carbon 6th Gen. (Intel Core i7 8th Gen, 16 GB RAM, 512 GB SSD). When I try to attach an external monitor via an HDMI cable the monitor receives no signal. Similarly, when I use the Thunderbold dock and attach two monitors (one via HDMI, one with DisplayPort) only the monitor attached with DisplayPort works; the monitor attached with HDMI stays black. This made me think if this is really a bug in the software. I saw people describing this issue with Windows installed; the solution was to hit a special key combination. Unfortunately, the multimedia keys all not all functional, specifically the F7 key, which seems to meant for "activate external monitor", has no function. --- ApportVersion: 2.20.9-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: peter 3510 F.... pulseaudio /dev/snd/controlC0: peter 3510 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=8aee1825-7879-4889-8de3-e57900548385 InstallationDate: Installed on 2018-04-06 (5 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180403) MachineType: LENOVO 20KHCTO1WW Package: linux (not installed) ProcFB: 0 EFI VGA 1 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10 RelatedPackageVersions: linux-restricted-modules-4.15.0-13-generic N/A linux-backports-modules-4.15.0-13-generic N/A linux-firmware 1.173 Tags: bionic Uname: Linux 4.15.0-13-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 02/27/2018 dmi.bios.vendor: LENOVO dmi.bios.version: N23ET37W (1.12 ) dmi.board.asset.tag: Not Available dmi.board.name: 20KHCTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN23ET37W(1.12):bd02/27/2018:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad X1 Carbon 6th dmi.product.name: 20KHCTO1WW dmi.product.version: ThinkPad X1 Carbon 6th dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763202/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp