ThinkPad X1 Carbon Gen 4 unable to boot 13.0-RC1

[Fred]

On 3/20/21 10:26 AM, Kevin Oberman wrote:
> On Sat, Mar 20, 2021 at 8:35 AM Fred via freebsd-stable <
> freebsd-stable at freebsd.org> wrote:
> 
>> 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 c
>>> 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
>>
> There are two long tickets about this. Take a look at tickets 248659
> <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248659> and 253288
> <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253288>. This problem
> appeared in 13-current in Jan 2020 and I first saw it on my new Lenovo L15
> that summer. It appears specific to Lenovo laptops. It appears that similar
> issues have been seen with Linux.

Thank for the links to the bug reports, it would appear to be the same 
issue. I tested my wife's X1 Carbon Gen 3 and it worked fine. Perhaps a 
bios bug with the processor in my 4th gen.

CPU: Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz (2808.11-MHz K8-class CPU)

In the 24 hours I tested 13.0, I also had some X windows failures while 
waking up from suspend which never happens with 12.2. Oh well, no worries.

> --
> Kevin Oberman, Part time kid herder and retired Network Engineer
> E-mail: rkoberman at gmail.com
> PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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