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!

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https://bugs.launchpad.net/bugs/1876741

Title:
  Lenovo X1 boot crash with HDMI cable attached and laptop lid closed

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