Hey AaronMa, What do you mean with "found that LID close until the BIOS logo show, unless the laptop will shut down."?
So you tested using the HDMI cable directly attached to the laptop and everything worked even with something attached to the thunderbolt port? Which kind of docking station are you using? With that said I've tried the latest BIOS: BIOS Information Vendor: LENOVO Version: N2OET42W (1.29 ) Release Date: 01/20/2020 Address: 0xE0000 Runtime Size: 128 kB ROM Size: 32 MB Characteristics: PCI is supported PNP is supported BIOS is upgradeable BIOS shadowing is allowed Boot from CD is supported Selectable boot is supported EDD is supported 3.5"/720 kB floppy services are supported (int 13h) Print screen service is supported (int 5h) 8042 keyboard services are supported (int 9h) Serial services are supported (int 14h) Printer services are supported (int 17h) CGA/mono video services are supported (int 10h) ACPI is supported USB legacy is supported BIOS boot specification is supported Targeted content distribution is supported UEFI is supported BIOS Revision: 1.29 Firmware Revision: 1.22 And results are the same: if something is attached to thunderbolt, no way to see even grub, if nothing is attached (and LID is closed) then I see grub loading on the external monitor but I don't get GDM. What do you mean exactly with "BIOS should be default setting with optimized enabled"? Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876741 Title: Lenovo X1 boot crash with HDMI cable attached and laptop lid closed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1876741/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs