Hi Maria, I don't think your issue is the same I got. Note that my problem happened with or without the dock, and I wasn't even reaching grub. That's the big difference here. If you lose the video after grub, than your problem is elsewhere, and my suggestion is to boot without "quiet splash" on the grup command line, so that you can see where the boot is stuck.
If it reaches the end of the boot process and it is just unable to start X (so GDM, LightDM or whatever), then your problem might be related to the drivers, maybe not blacklisting nouveau or things like these. Maybe as suggested elsewhere [1], you just need to uninstall the buggy xserver-xorg-video-intel package. What is more important here is that my problem got solved by setting the "Set Optimized" option in the BIOS to true. This solved a huge amount of problems, the last one I'm waiting to solve before closing this bug is to understand how to boot without a customized /etc/X11/xorg.conf. Hope this helps. [1] https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1879484 -- 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/1876741 Title: Lenovo X1 boot crash with HDMI cable attached and laptop lid closed Status in linux package in Ubuntu: Confirmed Bug description: Hey everyone, just upgraded to 20.04 in my Lenovo X1 Carbon laptop and found myself in really big troubles. I always started my laptop pressing the power button and then closing the laptop lid, because I'm using an external HDMI display. This worked always well with Ubuntu 19.10. With 20.04 the system crash. These are the actions that reproduce the problem: 1 - Boot the system, pressing the power button and closing the laptop lid with an external HDMI display attached to the laptop; 2 - See on the external HDMI display the boot progress: BIOS loading and then grub not appearing; 3 - Listen to the fans that are about to make the laptop lift; 4 - Press the power button to force off the laptop; At this point the only way to have everything back is: 1 - Detach any external device; 2 - Detach the power cable; 3 - Wait 3 seconds or more; 4 - Open the laptop lid; 5 - Attach the power cable; 6 - Press the power button; Without doing exactly as I written the laptop will not boot up, even if I force power off, after starting it again, after the BIOS display, the screen goes blank and the fans lift. NOTE 1: I already disabled secure boot in the BIOS, and also selected discrete graphics for the display (otherwise I'm not able to even start X); NOTE 2: the scenario is exactly the same with nvidia-driver-435 and nvidia-driver-440; NOTE 3: if I leave the laptop lid open, everything is just fine; ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-28-generic 5.4.0-28.32 ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30 Uname: Linux 5.4.0-28-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: rasca 2750 F.... pulseaudio /dev/snd/controlC1: rasca 2750 F.... pulseaudio /dev/snd/controlC0: rasca 2750 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon May 4 16:24:47 2020 InstallationDate: Installed on 2019-12-10 (146 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: LENOVO 20QVCTO1WW ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-28-generic root=UUID=c61df9cc-bd36-4ed2-8f52-de114bbf3fc3 ro rd.driver.blacklist=nouveau RelatedPackageVersions: linux-restricted-modules-5.4.0-28-generic N/A linux-backports-modules-5.4.0-28-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-04-28 (6 days ago) dmi.bios.date: 03/24/2020 dmi.bios.vendor: LENOVO dmi.bios.version: N2OET43W (1.30 ) dmi.board.asset.tag: Not Available dmi.board.name: 20QVCTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0T08861 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN2OET43W(1.30):bd03/24/2020:svnLENOVO:pn20QVCTO1WW:pvrThinkPadX1Extreme2nd:rvnLENOVO:rn20QVCTO1WW:rvrSDK0T08861WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad X1 Extreme 2nd dmi.product.name: 20QVCTO1WW dmi.product.sku: LENOVO_MT_20QV_BU_Think_FM_ThinkPad X1 Extreme 2nd dmi.product.version: ThinkPad X1 Extreme 2nd dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1876741/+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
