[BUG] Arrow Lake CPU reporting incorrect boost frequency on Debian Trixie

[nexthop0]

Read the FAQ first

• I have checked the FAQ but the issue is not covered

Description

I believe this to be a firmware bug as lscpu also sees the same bogus frequency of 6.50 GHz.. Filing this in hopes there is some workaround that can be done in Fastfetch other than hardcoding the true boost frequency.

Linux server 6.19.11+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.19.11-1~bpo13+1 (2026-04-13) x86_64

        _,met$$$$$gg.          user@server
     ,g$$$$$$$$$$$$$$$P.       --------------------
   ,g$$P""       """Y$$.".     OS: Debian GNU/Linux 13.4 (trixie) x86_64
  ,$$P'              `$$$.     Host: <redacted>
',$$P       ,ggs.     `$$b:    Kernel: Linux 6.19.11+deb13-amd64
`d$$'     ,$P"'   .    $$$     Uptime: 23 hours, 17 mins
 $$P      d$'     ,    $$P     Packages: 495 (dpkg)
 $$:      $$.   -    ,d$$'     Shell: bash 5.2.37
 $$;      Y$b._   _,d$P'       Terminal: /dev/pts/0
 Y$$.    `.`"Y$$$$P"'          CPU: Intel(R) Core(TM) Ultra 9 285 (24) @ 6.50 GHz
 `$$b      "-.__               GPU: Intel Graphics @ 2.00 GHz [Integrated]
  `Y$$b                        Memory: 3.80 GiB / 125.32 GiB (3%)
   `Y$$.                       Local IP (ens1): <redacted>
     `$$b.
       `Y$$b.
         `"Y$b._
             `""""

lscpu | grep MHz

CPU(s) scaling MHz:                      29%
CPU max MHz:                             6500.0000
CPU min MHz:                             800.0000

grep . /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_max_freq | sort -V

/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:5400000
/sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_max_freq:5600000
/sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_max_freq:5400000
/sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_max_freq:5400000
/sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_max_freq:5600000
/sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_max_freq:5400000
/sys/devices/system/cpu/cpu6/cpufreq/cpuinfo_max_freq:5400000
/sys/devices/system/cpu/cpu7/cpufreq/cpuinfo_max_freq:5400000
/sys/devices/system/cpu/cpu8/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu9/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu10/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu11/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu12/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu13/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu14/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu15/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu16/cpufreq/cpuinfo_max_freq:6500000
/sys/devices/system/cpu/cpu17/cpufreq/cpuinfo_max_freq:6500000
/sys/devices/system/cpu/cpu18/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu19/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu20/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu21/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu22/cpufreq/cpuinfo_max_freq:4700000
/sys/devices/system/cpu/cpu23/cpufreq/cpuinfo_max_freq:4700000

Version used

fastfetch 2.61.0 (x86_64)

Bug prevalence

Always

Regression

Not sure

Installation

GitHub Releases

Package manager

No response

Screenshots

No response

Configuration

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Features built-in

threads
vulkan
wayland
xcb-randr
xrandr
drm
drm_amdgpu
gio
dconf
dbus
imagemagick7
imagemagick6
chafa
zlib
sqlite3
rpm
egl
glx
opencl
libpulse
libddcutil
libelf
libzfs
linux/videodev2
linux/wireless
Embedded pciids

[CarterLi]

Filing this in hopes there is some workaround that can be done in Fastfetch other than hardcoding the true boost frequency.

What if the workaround is hardcoding the true boot frequency?

[CarterLi]

cpufetch retreive CPU frequency directly from CPU. You may check if it works for you. If yes, upgrading kernel may work; if no, it should be a CPU/BIOS issue, not a kernel issue

[nexthop0]

cpufetch pulls right frequency. Currently on the latest stable-backports kernel in Debian too, which is 6.19.11

user@server:~$ cpufetch
[ERROR]: Unknown microarchitecture detected: M=0x6 EM=0xC F=0x6 EF=0x0 S=0x2
[VERSION]: cpufetch v1.06 (Linux x86 / x86_64 build)
Please, create a new issue with this error message, the output of 'cpufetch' and 'cpufetch --debug' on https://github.com/Dr-Noob/cpufetch/issues
[ERROR]: Unknown microarchitecture detected: M=0x6 EM=0xC F=0x6 EF=0x0 S=0x2
[VERSION]: cpufetch v1.06 (Linux x86 / x86_64 build)
Please, create a new issue with this error message, the output of 'cpufetch' and 'cpufetch --debug' on https://github.com/Dr-Noob/cpufetch/issues

                                                              Name:                Intel(R) Core(TM) Ultra 9 285
                                                              Microarchitecture:   Unknown
                                                              Technology:          Unknown
                                                              P-cores:
                                                                Max Frequency:     5.600 GHz
                                                                Cores:             8 cores
                                                                AVX:               AVX,AVX2
                                                                FMA:               FMA3
                                                                L1i Size:          64KB (512KB Total)
                                                                L1d Size:          48KB (384KB Total)
                                                                L2 Size:           3MB (24MB Total)
                                                              E-cores:
                                                                Max Frequency:     4.600 GHz
                                                                Cores:             16 cores
                                                                AVX:               AVX,AVX2
                                                                FMA:               FMA3
                                                                L1i Size:          64KB (1MB Total)
                                                                L1d Size:          32KB (512KB Total)
                                                                L2 Size:           4MB (16MB Total)
                                                              L3 Size:             36MB
                                                              Peak Performance:    1.89 TFLOP/s