From: Aaron Rainbolt <arainbolt@kfocus.org>
To: srinivas.pandruvada@linux.intel.com
Cc: kernel-team@lists.ubuntu.com, lenb@kernel.org,
linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
rjw@rjwysocki.net, mmikowski@kfocus.org
Subject: Re: [BUG] intel_pstate: CPU frequencies miscalculated/incorrectly detected on Arrow Lake hardware
Date: Wed, 3 Dec 2025 11:38:51 -0600 [thread overview]
Message-ID: <20251203113851.52bf872b@kf-m2g5> (raw)
In-Reply-To: <20251126170031.145b6a56@kf-m2g5>
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On Wed, 26 Nov 2025 17:00:31 -0600
Aaron Rainbolt <arainbolt@kfocus.org> wrote:
> (Sorry for this rather malformed email, Claws *still* can't find the
> thread for some reason so I'm having to resort to a "mailto" link off
> of lore.kernel.org.)
>
> > I asked for some dumps before. We can try to inform the OEM of the
> > system as this is a BIOS tables issue. What is the make and model of
> > your system?
> >
> > Thanks,
> > Srinivas
>
> We're actively working on getting the dumps you mentioned previously
> for all three affected machines, along with the model info and some
> benchmarking results with our current production kernel and the latest
> mainline kernel. It's taking a bit longer than we expected, but we're
> pretty close. I should have more info by Monday if all goes according
> to plan on our end.
Hi Srinivas,
We ended up finding out that the frequency misreporting issue impacted
more machines than we thought, in different ways than we thought, so we
ended up a bit delayed. We did get many of the dumps you requested, and
also did some tests to see exactly how frequencies were getting
mis-reported. The actual dumps and the results of testing are long, so
I've attached them instead of pasting them in.
Some key things to note are:
* The manufacturer and model codes for each machine we tested are in the
"2025-11-26_cpu_freq_report.md" file.
* We're seeing the misreporting problems on at least five models of
machines from three different manufacturers (ASUS, Clevo, and
TongFang). Every Arrow Lake system we've checked is affected. This
doesn't rule out BIOS issues I guess, but it seems somewhat unlikely
that three manufacturers would mess up their BIOS in the same way.
The reports are for three models of Clevo machines and one ASUS NUC,
we haven't gotten final test results for the TongFang machine in
question.
* On all affected systems we've seen, *either* P-core frequency is
mis-reported, *or* E-core frequency is mis-reported, but never both.
One core type always has its frequencies reported correctly, the
other core type's frequencies are reported incorrectly.
* All systems tested were using the latest BIOS from the manufacturer,
to our awareness.
Thanks again, and let me know if there's any other info we can provide.
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/sys/devices/system/cpu/cpu19/acpi_cppc/guaranteed_perf:21
/sys/devices/system/cpu/cpu19/acpi_cppc/highest_perf:46
/sys/devices/system/cpu/cpu19/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu19/acpi_cppc/lowest_nonlinear_perf:15
/sys/devices/system/cpu/cpu19/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu19/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu19/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu19/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu19/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu1/acpi_cppc/feedback_ctrs:ref:32768244495 del:38393600658
/sys/devices/system/cpu/cpu1/acpi_cppc/guaranteed_perf:32
/sys/devices/system/cpu/cpu1/acpi_cppc/highest_perf:61
/sys/devices/system/cpu/cpu1/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu1/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu1/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu1/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu1/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu1/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu1/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu20/acpi_cppc/feedback_ctrs:ref:15631584212 del:15908355040
/sys/devices/system/cpu/cpu20/acpi_cppc/guaranteed_perf:21
/sys/devices/system/cpu/cpu20/acpi_cppc/highest_perf:46
/sys/devices/system/cpu/cpu20/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu20/acpi_cppc/lowest_nonlinear_perf:15
/sys/devices/system/cpu/cpu20/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu20/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu20/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu20/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu20/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu21/acpi_cppc/feedback_ctrs:ref:23249605556 del:26489009609
/sys/devices/system/cpu/cpu21/acpi_cppc/guaranteed_perf:21
/sys/devices/system/cpu/cpu21/acpi_cppc/highest_perf:46
/sys/devices/system/cpu/cpu21/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu21/acpi_cppc/lowest_nonlinear_perf:15
/sys/devices/system/cpu/cpu21/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu21/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu21/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu21/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu21/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu22/acpi_cppc/feedback_ctrs:ref:15766351504 del:16036289967
/sys/devices/system/cpu/cpu22/acpi_cppc/guaranteed_perf:21
/sys/devices/system/cpu/cpu22/acpi_cppc/highest_perf:46
/sys/devices/system/cpu/cpu22/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu22/acpi_cppc/lowest_nonlinear_perf:15
/sys/devices/system/cpu/cpu22/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu22/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu22/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu22/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu22/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu23/acpi_cppc/feedback_ctrs:ref:15008859188 del:16012788345
/sys/devices/system/cpu/cpu23/acpi_cppc/guaranteed_perf:21
/sys/devices/system/cpu/cpu23/acpi_cppc/highest_perf:46
/sys/devices/system/cpu/cpu23/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu23/acpi_cppc/lowest_nonlinear_perf:15
/sys/devices/system/cpu/cpu23/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu23/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu23/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu23/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu23/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu2/acpi_cppc/feedback_ctrs:ref:22957483783 del:28388697340
/sys/devices/system/cpu/cpu2/acpi_cppc/guaranteed_perf:32
/sys/devices/system/cpu/cpu2/acpi_cppc/highest_perf:61
/sys/devices/system/cpu/cpu2/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu2/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu2/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu2/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu2/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu2/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu2/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu3/acpi_cppc/feedback_ctrs:ref:38446441149 del:53438056561
/sys/devices/system/cpu/cpu3/acpi_cppc/guaranteed_perf:32
/sys/devices/system/cpu/cpu3/acpi_cppc/highest_perf:63
/sys/devices/system/cpu/cpu3/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu3/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu3/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu3/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu3/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu3/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu3/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu4/acpi_cppc/feedback_ctrs:ref:20838805244 del:25651369450
/sys/devices/system/cpu/cpu4/acpi_cppc/guaranteed_perf:32
/sys/devices/system/cpu/cpu4/acpi_cppc/highest_perf:61
/sys/devices/system/cpu/cpu4/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu4/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu4/acpi_cppc/lowest_perf:1
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/sys/devices/system/cpu/cpu4/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu4/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu4/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu5/acpi_cppc/feedback_ctrs:ref:19550796381 del:23272468368
/sys/devices/system/cpu/cpu5/acpi_cppc/guaranteed_perf:32
/sys/devices/system/cpu/cpu5/acpi_cppc/highest_perf:61
/sys/devices/system/cpu/cpu5/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu5/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu5/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu5/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu5/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu5/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu5/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu6/acpi_cppc/feedback_ctrs:ref:17609094176 del:20962277250
/sys/devices/system/cpu/cpu6/acpi_cppc/guaranteed_perf:32
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/sys/devices/system/cpu/cpu6/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu6/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu6/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu6/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu6/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu6/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu6/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu7/acpi_cppc/feedback_ctrs:ref:38715367978 del:55778897631
/sys/devices/system/cpu/cpu7/acpi_cppc/guaranteed_perf:32
/sys/devices/system/cpu/cpu7/acpi_cppc/highest_perf:63
/sys/devices/system/cpu/cpu7/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu7/acpi_cppc/lowest_nonlinear_perf:26
/sys/devices/system/cpu/cpu7/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu7/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu7/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu7/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu7/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu8/acpi_cppc/feedback_ctrs:ref:19160123376 del:21192607910
/sys/devices/system/cpu/cpu8/acpi_cppc/guaranteed_perf:21
/sys/devices/system/cpu/cpu8/acpi_cppc/highest_perf:46
/sys/devices/system/cpu/cpu8/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu8/acpi_cppc/lowest_nonlinear_perf:15
/sys/devices/system/cpu/cpu8/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu8/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu8/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu8/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu8/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu9/acpi_cppc/feedback_ctrs:ref:19086913404 del:21235914198
/sys/devices/system/cpu/cpu9/acpi_cppc/guaranteed_perf:21
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/sys/devices/system/cpu/cpu9/acpi_cppc/nominal_freq:2100
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/sys/devices/system/cpu/cpu9/acpi_cppc/wraparound_time:18446744073709551615
[-- Attachment #6: 2025-11-26_cpu_freq_report.md --]
[-- Type: text/markdown, Size: 9731 bytes --]
## Overview
This document details the incorrect CPU frequency limit reporting we have seen
on multiple systems and multiple Linux kernels. We analyzed the following
systems and report on them below.
ODM | Model | CPU | Kernel
----- | ---------- | ------------- | ------
Clevo | X580WNT-G | Ultra 9 275HX | 6.14.0-34-kfocus
" | " | " | 6.18.0-061800rc7-generic (Mainline)
Clevo | X580WNS-G | Ultra 9 275HX | 6.14.0-34-kfocus
" | " | " | 6.18.0-061800rc7-generic (Mainline)
Clevo | X560WNR-G | Ultra 9 275HX | 6.14.0-34-kfocus
" | " | " | 6.18.0-061800rc7-generic (Mainline)
Asus | NUC15CRKU5 | Ultra 5 225H | 6.14.0-34-kfocus
" | " | " | 6.18.0-061800rc7-generic (Mainline)
Asus | NUC15CRKU7 | Ultra 7 255H | 6.14.0-34-kfocus
" | " | " | 6.18.0-061800rc7-generic (Mainline)
See separate reports for the output of the following:
```bash
grep . /sys/devices/system/cpu/cpu*/acpi_cppc/*
```
The mainline kernels were download and installed from [this Ubuntu
site][_0090].
Generally, the E-cores report frequncies as expected: the claimed frequency
limits provided by the CPU (`cpuinfo_max_freq`, `base_frequency`), the
Spec-Sheet frequencies, and the measured frequencies attained
(`scaling_cur_freq`) all agree.
However, the P-cores are have issues with the claimed frequency limits
provided by the CPU (`cpuinfo_max_freq`, `base_frequency`). These do NOT match
the Spec-Sheet frequencies or the measured frequencies attained
(`scaling_cur_freq`).
These errors are a problem because they are used by multiple tools to help
manage the CPU power usage. Performance can lowered if the claimed frequency
limits are lower than they should be; conversely, power-saving tools that rely
on these values will not work if the reported values are too high.
## Scan Results Key
Each section contains a 'Scan Results' table that shows the specified,
claimed, and reported frequencies. Notice that all cores of a given type are
scanned, since not only are there P and E cores, but within these groups there
may also be "golden" cores that provide higher frequency capabilities. For
example, the Ultra 9 275HX's 2 golden P-cores have a max freq of 5.4 GHz,
whereas other P-cores can only attain 5.2 GHz.
Column | Values | Purpose
--------|--------|---------
Type | P|E | The subset of cores this row applied to.
| | For example, `P` means `all P-cores`.
Turbo | off|ON | The turbo setting of this core subset.
B-Claim | int Hz | The max `base_frequency` value of this core subset.
Id | int | The core id that provided the Base-Claim value.
B-Spec | int Hz | Intel SPEC'D BASE freq for this CPU's core Type.
M-Claim | int Hz | The max `cpuinfo_max_freq` value of this core subset.
Id | int | The core id that provided the Max-Claim value.
M-Spec | int Hz | Intel SPEC'D MAX freq for this CPU's core Type.
M-Test | int Hz | The max `scaling_cur_freq` value of this core subset.
| | The entire core subset is sampled 200x.
Id | int | The core id that provided the Max-Test value.
## Clevo | X580WNT-G | Ultra 9 275HX | 6.14.0-34-kfocus
The Intel specified values were copied from [this page][_0100].
### Scan Results
CPU: Intel Core Ultra 9 275HX
Type | Turbo | B-Claim . Id | B-Spec | M-Claim . Id | M-Spec | M-Test . Id
-----| ----- | ------------ | ------- | ------------ |-------- | ------------
P | off | 2000000 . 07 | 2700000 | 2000000 . 07 | 2700000 | 2708723 . 00
P | ON | 2000000 . 07 | 2700000 | 3900000 . 07 | 5400000 | 5414342 . 03
E | off | 2100000 . 17 | 2100000 | 2100000 . 17 | 2100000 | 2175694 . 09
E | ON | 2100000 . 17 | 2100000 | 4600000 . 17 | 4600000 | 4723780 . 14
### Assessment
1. The E-cores correctly report `base_frequency` and `cpuinfo_max_freq`.
- pass: With Turbo ON or off, Claimed capabilities (B-Claim, M-Claim) match
Intel specs (B-Spec, M-Spec).
- pass: With Turbo ON or off, the measured frequencies (M-Test) are in-line with
Intel pecs (M-Spec), and match claimed capabilities.
2. The P-cores under report `base_frequency` and `cpuinfo_max_freq`.
- FAIL: With Turbo ON or off, the claimed `base_freqency` (B-Claim) of 2000000 does
NOT match the Intel spec (B-Spec) of 2700000.
- FAIL: With Turbo off, the claimed `cpuinfo_max_freq` (M-Claim) of 2000000 does
NOT match the Intel spec (M-Spec) of 2700000.
- FAIL: With Turbo ON, the claimed `cpuinfo_max_freq` (M-Claim) of 3900000 does
NOT match the Intel spec (M-Spec) of 5400000.
- pass: With Turbo ON or off, the measured `scaling_cur_freq` (M-Test) values are
in-line with Intel specs (M-Spec).
## Clevo | X580WNT-G | Ultra 9 275HX | 6.18.0-061800rc7-generic (Mainline)
The Intel specified values were copied from [this page][_0100].
### Scan Results
CPU: Intel Core Ultra 9 275HX
Type | Turbo | B-Claim . Id | B-Spec | M-Claim . Id | M-Spec | M-Test . Id
-----| ----- | ------------ | ------- | ------------ |-------- | ------------
P | off | 2000000 . 07 | 2700000 | 2000000 . 07 | 2700000 | 2700054 . 01
P | ON | 2000000 . 07 | 2700000 | 3900000 . 07 | 5400000 | 5400054 . 07
E | off | 2100000 . 17 | 2100000 | 2100000 . 17 | 2100000 | 2140243 . 17
E | ON | 2100000 . 17 | 2100000 | 4600000 . 17 | 4600000 | 4653899 . 16
### Assessment
The assessment is the same as found for section `Clevo | X580WNT-G | Ultra 9
275HX | 6.14.0-34-kfocus`:
1. The E-cores pass all tests.
2. The P-cores under report `base_frequency` and `cpuinfo_max_freq` in the
exact same way.
## Clevo | X580WNS-G | Ultra 9 275HX | 6.14.0-34-kfocus
### Scan Results
CPU: Intel Core Ultra 9 275HX
Type | Turbo | B-Claim . Id | B-Spec | M-Claim . Id | M-Spec | M-Test . Id
-----| ----- | ------------ | ------- | ------------ |-------- | ------------
P | off | 2700000 . 07 | 2700000 | 2700000 . 07 | 2700000 | 2700054 . 02
P | ON | 2700000 . 07 | 2700000 | 5400000 . 03 | 5400000 | 5400054 . 00
E | off | 3000000 . 17 | 2100000 | 3000000 . 17 | 2100000 | 2138214 . 22
E | ON | 3000000 . 17 | 2100000 | 6500000 . 17 | 4600000 | 4765000 . 21
### Assessment
In contrast to the X580WNT-G, the P-Cores here report correctly, whereas the
E-cores are incorrect.
## Clevo | X560WNR-G | Ultra 9 275HX | 6.14.0-34-kfocus
The Intel specified values were copied from [this page][_0100].
### Scan Results
CPU: Intel Core Ultra 9 275HX
Type | Turbo | B-Claim . Id | B-Spec | M-Claim . Id | M-Spec | M-Test . Id
-----| ----- | ------------ | ------- | ------------ |-------- | ------------
P | off | 2000000 . 07 | 2700000 | 2000000 . 07 | 2700000 | 2703982 . 00
P | ON | 2000000 . 07 | 2700000 | 3900000 . 03 | 5400000 | 5400000 . 03
E | off | 2100000 . 17 | 2100000 | 2100000 . 17 | 2100000 | 2132738 . 18
E | ON | 2100000 . 17 | 2100000 | 4600000 . 17 | 4600000 | 4710638 . 15
### Assessment
The assessment is the same as found for section `Clevo | X580WNT-G | Ultra 9
275HX | 6.14.0-34-kfocus`:
1. The E-cores pass all tests.
2. The P-cores pass all tests.
## Clevo | X560WNR-G | Ultra 9 275HX | 6.18.0-061800rc7-generic (Mainline)
The Intel specified values were copied from [this page][_0100].
### Scan Results
CPU: Intel Core Ultra 9 275HX
Type | Turbo | B-Claim . Id | B-Spec | M-Claim . Id | M-Spec | M-Test . Id
-----| ----- | ------------ | ------- | ------------ |-------- | ------------
P | off | 2000000 . 07 | 2700000 | 2000000 . 07 | 2700000 | 2700027 . 03
P | ON | 2000000 . 07 | 2700000 | 3900000 . 03 | 5400000 | 5400000 . 03
E | off | 2100000 . 17 | 2100000 | 2100000 . 17 | 2100000 | 2134000 . 08
E | ON | 2100000 . 17 | 2100000 | 4600000 . 17 | 4600000 | 4711250 . 14
### Assessment
The assessment is the same as found for section `Clevo | X580WNT-G | Ultra 9
275HX | 6.14.0-34-kfocus`:
1. The E-cores pass all tests.
2. The P-cores under report `base_frequency` and `cpuinfo_max_freq` in the
exact same way.
## Asus | NUC15CRKU5 | Ultra 5 225H | 6.14.0-34-kfocus
" | " | " | 6.18.0-061800rc7-generic (Mainline)
The Intel specified values were copied from [this page][_0100].
### Scan Results
CPU: Intel Core Ultra 5 225H
Type | Turbo | B-Claim . Id | B-Spec | M-Claim . Id | M-Spec | M-Test . Id
-----| ----- | ------------ | ------- | ------------ |-------- | ------------
P | off | 1700000 . 03 | 1700000 | 1700000 . 03 | 1700000 | 1805625 . 00
P | ON | 1700000 . 03 | 1700000 | 4900000 . 03 | 4900000 | 4900049 . 03
E | off | 1300000 . 11 | 1300000 | 1300000 . 11 | 1300000 | 1502459 . 09
E | ON | 1300000 . 11 | 1300000 | 4400000 . 11 | 4300000 | 4320736 . 10
### Assessment
1. The P-cores look mostly correct.
1.a. Minor issue: with Turbo off, the claimed and spec freq match, but the
tested max freq is around 6% greater (1700000 = 1700000 < 1805625).
2. The E-cores look mostly correct.
1.a. Minor issue: with Turbo off, the spec and claimed max freq match, but
the max freq is around 16% greater (1300000 = 1300000 < 1502459).
2.a Minor issue: with Turbo ON, the claimed max freq is greater than the
spec, but measured freq is closer to spec (4400000 > 4300000 < 4320736).
## Asus | NUC15CRKU5 | Ultra 5 225H | 6.18.0-061800rc7-generic (Mainline)
TODO
## Asus | NUC15CRKU7 | Ultra 7 255H | 6.14.0-34-kfocus
TODO
## Asus | NUC15CRKU7 | Ultra 7 255H | 6.18.0-061800rc7-generic (Mainline)
TODO
[_0090]:https://kernel.ubuntu.com/mainline/v6.18-rc7
[_0100]:https://www.intel.com/content/www/us/en/products/sku/242293/intel-core-ultra-9-processor-275hx-36m-cache-up-to-5-40-ghz/specifications.html
[-- Attachment #7: 2025-11-28_6.14.0-34-X580WNS-G-acpi_cppc.dump.txt --]
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/sys/devices/system/cpu/cpu0/acpi_cppc/feedback_ctrs:ref:222947587336 del:265250152806
/sys/devices/system/cpu/cpu0/acpi_cppc/guaranteed_perf:44
/sys/devices/system/cpu/cpu0/acpi_cppc/highest_perf:87
/sys/devices/system/cpu/cpu0/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu0/acpi_cppc/lowest_nonlinear_perf:36
/sys/devices/system/cpu/cpu0/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq:2700
/sys/devices/system/cpu/cpu0/acpi_cppc/nominal_perf:43
/sys/devices/system/cpu/cpu0/acpi_cppc/reference_perf:49
/sys/devices/system/cpu/cpu0/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu10/acpi_cppc/feedback_ctrs:ref:104962667500 del:107644788904
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/sys/devices/system/cpu/cpu10/acpi_cppc/highest_perf:65
/sys/devices/system/cpu/cpu10/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu10/acpi_cppc/lowest_nonlinear_perf:21
/sys/devices/system/cpu/cpu10/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu10/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu10/acpi_cppc/nominal_perf:29
/sys/devices/system/cpu/cpu10/acpi_cppc/reference_perf:43
/sys/devices/system/cpu/cpu10/acpi_cppc/wraparound_time:18446744073709551615
/sys/devices/system/cpu/cpu11/acpi_cppc/feedback_ctrs:ref:141643551420 del:158019120345
/sys/devices/system/cpu/cpu11/acpi_cppc/guaranteed_perf:30
/sys/devices/system/cpu/cpu11/acpi_cppc/highest_perf:65
/sys/devices/system/cpu/cpu11/acpi_cppc/lowest_freq:0
/sys/devices/system/cpu/cpu11/acpi_cppc/lowest_nonlinear_perf:21
/sys/devices/system/cpu/cpu11/acpi_cppc/lowest_perf:1
/sys/devices/system/cpu/cpu11/acpi_cppc/nominal_freq:2100
/sys/devices/system/cpu/cpu11/acpi_cppc/nominal_perf:29
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[-- Attachment #8: 2025-11-29_6.14.0-34-NUC15CRKU5-acpi_cppc.dump.txt --]
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/sys/devices/system/cpu/cpu9/acpi_cppc/wraparound_time:18446744073709551615
next prev parent reply other threads:[~2025-12-03 17:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-18 3:33 [BUG] intel_pstate: CPU frequencies miscalculated/incorrectly detected on Arrow Lake hardware Aaron Rainbolt
2025-05-19 12:48 ` srinivas pandruvada
2025-11-06 19:46 ` Aaron Rainbolt
2025-07-22 16:31 ` Aaron Rainbolt
2025-07-22 17:24 ` srinivas pandruvada
2025-11-26 23:00 ` Aaron Rainbolt
2025-12-03 17:38 ` Aaron Rainbolt [this message]
2025-12-05 19:10 ` srinivas pandruvada
2025-12-05 19:28 ` Rafael J. Wysocki
2025-12-05 19:50 ` srinivas pandruvada
2025-12-05 20:04 ` Rafael J. Wysocki
2025-12-15 0:45 ` Aaron Rainbolt
2025-12-15 14:16 ` srinivas pandruvada
2025-12-15 15:25 ` Aaron Rainbolt
2025-12-17 13:33 ` srinivas pandruvada
2025-12-23 17:41 ` Aaron Rainbolt
2025-12-23 19:21 ` srinivas pandruvada
2026-01-11 4:53 ` Russell Haley
2026-01-26 16:14 ` Aaron Rainbolt
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