freebsd stable - Mar 2021 - ThinkPad X1 Carbon Gen 4 unable to boot 13.0-RC1

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?
Cheers, 
Fred

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
> Cheers, 
> Fred
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-- 
Mathias Picker                        
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Mathias.Picker at virtual-earth.de

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