Bug#940911: TPM error with Debian Live Testing

[Richard]

Package: GRUB
Version 2.04-3


I first raised the issue on the Debian forums and it was suggested to me
that this appears to be a GRUB issue as TPM support was recently added to
GRUB in testing.

I have an ASUS G752vs laptop running Linux Mint LMDE 3 and Windows 10. I
created three Debian Live Testing USB sticks using the following weekly
live builds (all with a last modified date of 2019-09-16):

  debian-live-testing-amd64-xfce.iso
  debian-live-testing-amd64-cinnamon.iso
  debian-live-testing-amd64-gnome.iso

Unfortunately, I receive the following error messages with all three:

After pressing "Debian GNU/Linus Live (kernel 5.2.0-2-amd64)" I see:
  error: Unknown TPM error.
  error: Unknown TPM error.
  error: You need to load the kernel first

  Press any key to continue...

I'm then returned to the main screen

If I press Debian Live with Localisation Support
I see a full screen of "error: Unknown TPM error.", followed by "Press any
key to continue..."

I'm then sent to a screen to choose my language with GNU GRUB version
2.04-3 at the top.

After choosing English, I receive the first set of error messages noted
above.

To trouble shoot, I have done the following:

  1. Tested the live testing USBs in an older desktop computer without TPM
... They work fine.

  2. Created a USB with debian-live-10.1.0-amd64-cinnamon.iso ... It works
fine on my laptop.

  3. I thought maybe it was a kernel issue. So I created a live USB with
Manjaro xfce 18.1.0 (which has kernel 5.2.11). It ran without any issue on
my laptop.

  4. I disabled secured boot in the bios and that didn't resolve the issue.
The laptop also does not have the option to disable TPM in the bios as it
is running Intel's TPM 2.0 version 11.0.2 1003.  The laptop also does not
have the option to boot in BIOS/legacy mode.

So in summary, the only combination that didn't work was the Debian testing
with my laptop.

Please let me know if you require any additional information.

Richard
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