ThinkPad X1 Carbon Gen 4 unable to boot 13.0-RC1

[Fred]

On 3/19/21 7:59 PM, Mathias Picker wrote:
> 
> Fred Hall via freebsd-stable <freebsd-stable at freebsd.org> writes:
> 
>> I have a ThinkPad X1 Carbon Gen 4 (20FCS0NB00) which has happily run 
>> FreeBSD 11 and 12, but which can't boot 13.0-RC1 from memstick or via 
>> freebsd-update. In both cases the boot process locks up on the line 
>> "hwpstate_intel0: <Intel Speed Shift> on cpu0"
>> If running freebsd-update, a work around is to add 
>> hint.hwpstate_intel.0.disabled="1" in loader.conf. See the note under 
>> the Eighth Generation (2020) in 
>> https://wiki.freebsd.org/Laptops/Thinkpad_X1_Carbon
>> I was quite surprised to find the lack of support for hwpstate_intel 
>> in 13 when it apparently worked under 11 and 12. Does anyone know the 
>> status of hwpstate_intel on ThinkPads?
> 
> I’m running 13 -STABLE from 10 days ago on a Thinkpad Yoga 3rd gen, and 
> hwpstate_intel works fine, never had a problem.
> 
> mathiasp:~% sysctl dev.hwpstate_intel dev.hwpstate_intel.7.epp: 15
> dev.hwpstate_intel.7.%parent: cpu7
> dev.hwpstate_intel.7.%pnpinfo: dev.hwpstate_intel.7.%location: 
> dev.hwpstate_intel.7.%driver: hwpstate_intel
> dev.hwpstate_intel.7.%desc: Intel Speed Shift
> dev.hwpstate_intel.6.epp: 15
> dev.hwpstate_intel.6.%parent: cpu6
> dev.hwpstate_intel.6.%pnpinfo: dev.hwpstate_intel.6.%location: 
> dev.hwpstate_intel.6.%driver: hwpstate_intel
> dev.hwpstate_intel.6.%desc: Intel Speed Shift
> [snip]
> 
> The gen3 is using
> sudo dmesg|grep -i cpu
> CPU: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz (1992.08-MHz K8-class CPU)
> [snip, snip]
> 
> mathiasp:~% uname -a
> FreeBSD Danton 13.0-STABLE FreeBSD 13.0-STABLE #2 
> stable/13-n244845-f21c0366f53: Wed Mar 10 20:53:26 CET 2021 
> root at Danton:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64
> 
> 
> Cheers,
> 
> Mathias

Thanks for the feed back. Good to know most people won't encounter the 
problem. Perhaps it is a bios issue specific to the model. I did update 
to the latest bios version but that made no difference.

I have chosen to rollback to 12.2 as it works perfectly for me.

> 
>> Cheers, Fred
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> 
>