I'm having the same problem on a Lenovo T430. If I boot the laptop on its own, it boots fine. If it's on the dock, which has two external monitors attached to it, it boots until it gets to the Ubuntu splash screen with the spinning propeller tips and never passes that point. I've left it on overnight and it never completes booting to the desktop.
If I boot it on it's own, sign in to the desktop, and then dock it, both external monitors are recognized and opening/closing the lid toggles the multiple pane layouts as expected. Like Tim, I can get it to fully boot on the dock with multiple monitors by updating /etc/default/grub to GRUB_CMDLINE_LINUX_DEFAULT="". -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1872159 Title: booting with splash hangs when external monitors are connected (pure intel 8th gen laptop) Status in plymouth package in Ubuntu: Confirmed Status in xorg package in Ubuntu: Confirmed Bug description: I think this is a problem with the splash boot loader. This problem is not reproduced if using nosplash. I have installed 20.04 to this laptop. Thinkpad T480, i7, intel graphics. Clean install of 20.04 beta, not an upgrade. When booting from the install, the greeter screen is never reached if external monitors are connected at startup. I get the spinning ubuntu logo, and nothing more. I can not change to virtual terminals. The fsck step does not commence. In recovery mood, I can log in. With no external monitors attached, it works. I am used to having such problems with Nvidia graphics is involved, but this is not the case on this laptop. It has been happily running 18.04. External displays are recognised if they are connected after login. Also, when I edit /etc/default/grub so that it reads GRUB_CMDLINE_LINUX_DEFAULT="" (that is, splash disabled) it works fine with two external monitors attached. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu26 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Sat Apr 11 13:58:19 2020 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu DkmsStatus: acpi-call, 1.1.0, 5.4.0-21-generic, x86_64: installed tp_smapi, 0.43, 5.4.0-21-generic, x86_64: installed ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Lenovo UHD Graphics 620 [17aa:225d] InstallationDate: Installed on 2020-04-10 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402) MachineType: LENOVO 20L5S00F00 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=/dev/mapper/myvg-root ro SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/19/2020 dmi.bios.vendor: LENOVO dmi.bios.version: N24ET56W (1.31 ) dmi.board.asset.tag: Not Available dmi.board.name: 20L5S00F00 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: None dmi.modalias: dmi:bvnLENOVO:bvrN24ET56W(1.31):bd02/19/2020:svnLENOVO:pn20L5S00F00:pvrThinkPadT480:rvnLENOVO:rn20L5S00F00:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad T480 dmi.product.name: 20L5S00F00 dmi.product.sku: LENOVO_MT_20L5_BU_Think_FM_ThinkPad T480 dmi.product.version: ThinkPad T480 dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.101-1 version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.4-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1872159/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp