Grub: "TPM event log is full" can't start Tumbleweed, not even snapshot

English Install/Boot/Login
1

https://photos.app.goo.gl/vWFNb3c5zHzWb8LX9

Ran into some issues and found myself needing to use a snapshot to get back in. No worries. That’s why they’re there. Tried to fix the issue and restarted the computer. Now I am getting this errors even with snapshots.
Does anyone know how to fix this?
Thanks in advance

2

Assuming that you enabled trusted boot (you never said that) - the message comes from your firmware/TPM. More precisely, call into TPM fails with error. You can try disabling TPM in your BIOS setup then grub will skip these calls.

3

I’m having the same problem. It happened after the latest grub2 update (several grub2 packages including the .efi file). I have Secure Boot and TPM 2.0 switched on, as I keep Windows 11 installed in parallel which those are a requirement for (at least MS blocks Win11 installation and some updates if they are off).

At first I got only the grub prompt when rebooting after the update. Any command I tried resulted in a grub error saying “TPM event log is full”. I tried clearing the TPM through Windows and within my UEFI which didn’t change anything.

The problem does not occur when I switch Secure Boot off in my UEFI and then select the non-Secure Boot opensuse option in my UEFI’s boot menu. I can then either reinstall grub2 which removes secure boot support and the new default boot option works fine. But then I lose Secure Boot altogether. Or I can rollback to a snapshot before the grub2 update, reinstall grub2 from there and it then works fine with Secure Boot activated. That’s also not optimal as I wouldn’t want to keep skipping grub2 updates.

Is there a way to fix the TPM log? Where do I even find it? I couldn’t find anything useful on the internet. Also why is that a problem only with the latest grub2? Did it add/change functionality that makes this problem surface or is it possibly a bug in grub2?

4

Hopefully fix is already submitted, wait until it is included in Tumbleweed

Thu Aug 18 02:47:28 UTC 2022 - Michael Chang <mchang@suse.com>


- Fix tpm error stop tumbleweed from booting (bsc#1202374)
  * 0001-tpm-Pass-unknown-error-as-non-fatal-but-debug-print-.patch
- Patch Removed
  * 0001-tpm-Log-EFI_VOLUME_FULL-and-continue.patch
5

Today the updates for Tumbleweed included a new grub2 version and I can confirm it works fine again. :slight_smile: