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    You might find this article useful: rodsbooks.com/efi-bootloaders/controlling-sb.html -- sorry, I've not touched UEFI with a six foot pole for quite some time having preferred to move off x86 after implementing UEFI/SB in our distro and looking where it all goes so didn't quite go through your question in detail... Commented Feb 25, 2021 at 17:04
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    It's interesting, I might want to kick out Microsoft and sign my own shim, or hell, do I even need a shim at that point? I could just load GRUB directly. But I'm not quite there yet. First I want to understand how and why it currently works, and predict if the host is going to come back after a reboot. Realistically, I don't really want to kick out the distro and HP, because they sign kernels and firmware updates. But MS is just kind of there in the boot process for whatever reason, doing almost nothing. Commented Feb 25, 2021 at 18:54