Comment 27 for bug 1829620

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TJ (tj) wrote : Re: intel-microcode on ASUS makes kernel stuck during loading initramfs on bionic-updates, bionic-security

Mark:

An additional kernel command-line option that might reveal more would be remove "quiet splash" and add "debug early_print=XXX" where XXX is vga for BIOS-mode or efi for UEFI mode boots.

You may find "earlycon" added into the mix may also add more early messages.

See https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html