See attached dmesg-processor.nocst=1 acpidump
I haven't been able to capture the buffer from an incomplete boot,
but the kernel is still hanging at many different points when no
options are added to the kernel commandline.
I have found a few other kernel options that also work with varying
degrees of usefulness.
<nocrs>
<processor.max_cstate=hw>
<processor.max_cstate=acpi>
As well as a few options that work sometimes but also hang sometimes.
<no_acpi>
worked twice but timed out populating dev, iirc,
and also hung after gdm3 started
with no keyboard and mouse input.
But I was able to ssh in and save dmesg and acpidump
<processor.max_cstate=0>
also seems to work with a timeout somewhere
"probably populating dev"
I only tested this "undocumented" option
once.
I've also captured dmesg and acpidump labeled with each of the above
options
dmesg-nocrs
acpi-nocrs
dmesg-no_acpi
apci-no_acpi
etc.
best regards,
Will