i5-12400 - 0 MHz
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It would be worth trying previous nightlies to see at what hrev the issue started so as to narrow down what change might have caused it.
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~> sysinfo
Kernel name: kernel_x86_64 built on: Aug 28 2026 06:04:32 version 0xa01 12 Intel 12th Gen Core™ i5-12400, revision 90675 running at 0MHz
~> sysinfo
Kernel name: kernel_x86_64 built on: Aug 23 2026 06:58:58 version 0xa01
12 Intel 12th Gen Core™ i5-12400, revision 90675 running at 0MHz
hrev60014 64 bit
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Are you familiar with the rabbit and the tortoise fable? Till now, manufacturers engineers were designing rabbit like CPU always trying to get faster. But one has heard the tale and guess what? You’re the happy owner of the first tortoise like CPU. It doesn’t run fast but at the end of the day, job has been done faster. 
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~> sysinfo
Kernel name: kernel_x86_64 built on: Aug 20 2026 06:48:01 version 0xa01
12 Intel 12th Gen Core™ i5-12400, revision 90675 running at 0MHz
hrev59998 64 bit
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If you can, going back quite a few more hrevs in the nightlies like to the early 599xx’s, seeing if the issue is there and if not then go forward through them to where it breaks may also help find it quicker.
I don’t have the issue on my i7-4790K based system I normally use but out of curiosity I tried a recent nightly on my 2017 Surface Pro. Low and behold it exhibits the same issue. I’ll also try to narrow down the hrev where the issue started and add a comment to the ticket on Trac.
EDIT: The issue started between hrev59964 and hrev59970 as it shows the correct clock speed on the former but ‘0 MHz’ on the latter. If you can confirm this as well @kim1963, that would be great.
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My bet would be hrev59967, then.
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I agree. I also mentioned that hrev in the ticket on Trac earlier too.
Indeed.
For those interested, it’s tracked under 20282.
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~> sysinfo
Kernel name: kernel_x86_64 built on: Sep 1 2026 06:16:01 version 0xa01
12 Intel 12th Gen Core™ i5-12400, revision 90675 running at 2500MHz
CPU #0: “12th Gen Intel(R) Core™ i5-12400”
Frequency: 1590.820
Fixed - hrev60059 64 bit
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