Mark, thanks for all the testing. Unfortunately, I asked Steve to have you try the wrong 'mds=' option.
Can you try to boot with the latest Ubuntu kernel, with the problematic microcode, using 'mds=off' on the kernel command line? (Note that it is 'off' instead of 'no')
If that doesn't work, can you try to boot with 'mitigations=off' passed on the kernel command line?
Mark, thanks for all the testing. Unfortunately, I asked Steve to have you try the wrong 'mds=' option.
Can you try to boot with the latest Ubuntu kernel, with the problematic microcode, using 'mds=off' on the kernel command line? (Note that it is 'off' instead of 'no')
If that doesn't work, can you try to boot with 'mitigations=off' passed on the kernel command line?