dmesg output when HDMI is working ** Attachment added: "dmesg-working" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886230/+attachment/5389517/+files/dmesg-working
-- 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/1886230 Title: Thinkpad P1 Gen2 HDMI doesn't work after log out or reboot Status in linux package in Ubuntu: New Bug description: I have a Thinkpad P1 Gen 2. This specific machine was customized to NOT have a discrete Nvidia GPU. It ONLY has an integrated Intel UHD 630 GPU. This is not a hardware issue as Windows seems to handle things correctly. With an external monitor connected via HDMI, boot proceeds OK with the external monitor displaying the boot process. I log in to a Gnome session using X. After login, I am able to open the display settings GUI and set mode to "single display" with the built-in LCD disabled and the external monitor enabled. This works correctly. However, if I then reboot the machine with the external monitor connected: 1. Boot proceeds correctly with the boot process shown on the external monitor. 2. After login, the external monitor is powered off and the built-in LCD is enabled. The "display settings" GUI shows the external monitor as a connected "Unknown Display" with the wrong resolution of 1024x768. Attempting to use the GUI to set "single display" as above results in the external monitor still being powered off, and the built-in LCD also powered off. I have to press esc to cancel the display changes. At this point, the relevant output of `xrandr` is: ```` DP1 connected 1024x768+3840+0 (normal left inverted right x axis y axis) 600mm x 340mm 1024x768 60.00* 800x600 60.32 56.25 848x480 60.00 640x480 59.94 ```` DP1 is the HDMI output, and it is listed at the wrong resolutions. If I disconnect the HDMI cable then run `xrandr` again, the output of `xrandr` is unchanged: it still lists DP1 as connected (!) even though the cable is disconnected. This bug also occurs if instead of rebooting, I simply log out and log back in again. The only solution appears to be to unplug the HDMI cable, shut down the machine (not reboot or log out), power on, log in, and at the desktop plug in the HDMI cable. At that point it works again. Rebooting does not solve the issue. It seems that a complete shutdown is required. I tested on Ubuntu 20.04's stock kernel 5.4.0 and also kernel 5.7.7 and the issue is present on both versions. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-40-generic 5.4.0-40.44 ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44 Uname: Linux 5.4.0-40-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: alex 1888 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: GNOME Date: Fri Jul 3 16:00:55 2020 InstallationDate: Installed on 2020-07-03 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: LENOVO 20QTCTO1WW ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/usr/bin/zsh ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic root=UUID=f8b7e5a7-d866-4a48-aef0-b430465ab66d ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-40-generic N/A linux-backports-modules-5.4.0-40-generic N/A linux-firmware 1.187.1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/20/2020 dmi.bios.vendor: LENOVO dmi.bios.version: N2OET42W (1.29 ) dmi.board.asset.tag: Not Available dmi.board.name: 20QTCTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0R32862 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN2OET42W(1.29):bd01/20/2020:svnLENOVO:pn20QTCTO1WW:pvrThinkPadP1Gen2:rvnLENOVO:rn20QTCTO1WW:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad P1 Gen 2 dmi.product.name: 20QTCTO1WW dmi.product.sku: LENOVO_MT_20QT_BU_Think_FM_ThinkPad P1 Gen 2 dmi.product.version: ThinkPad P1 Gen 2 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886230/+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
