On Wed, Nov 11, 2026 at 1:03 AM Angela Arch Linux <[email protected]> wrote:
> Hi Timothy, > > Thanks for the precise output. Now we have the definitive answer. > > Since your CPU has the `cppc` flag, the hardware is perfectly capable. > However, the `modinfo` output reveals the real issue: `Module amd_pstate > not found`. > > This means the Debian kernel you are running was compiled WITHOUT the > `amd_pstate` module. No matter what you put in GRUB, the kernel simply > doesn't have the code to load it. This also explains why Fedora works—their > kernel has it built-in. > > There are only a few options left: > 1. Use the `linux-image-amd64` from backports (if available), which might > have a newer kernel config. > 2. Or, accept that Debian's default kernel won't support it, and > `acpi-cpufreq` is the only driver you can use. In this case, the > "Performance" profile simply won't appear in `power-profiles-daemon`. > > You can safely remove `amd_pstate=active` from your GRUB to avoid any > unnecessary conflicts, and just enjoy the two profiles you have. > > It's a kernel packaging limitation, not your fault. > > Hope this helps. > Thanks for all of your help. I appreciate it. > > ---- 回复的原邮件 ---- > 发件人 Timothy M Butterworth<[email protected]> > <[email protected]> > 日期 2026年11月11日 13:59 > 收件人 Angela Arch Linux<[email protected]> <[email protected]> > 抄送至 heck-schneider<[email protected]> > <[email protected]>、debian-user<[email protected]> > <[email protected]> > 主题 Re: Re: Re: Re: Power Profiles not supported > > > On Wed, Nov 11, 2026 at 12:53 AM Angela Arch Linux <[email protected]> > wrote: > >> Hi Timothy, >> >> First, don't worry about the `bash: acpi-cpufreq: command not found` >> error—you accidentally typed the *output* of `cat` as a command. The actual >> output was `acpi-cpufreq`, which confirms the driver is still the legacy >> one. >> >> Now, about why `amd_pstate=active` didn't take effect. This is likely a >> deeper hardware/firmware issue: >> >> 1. Check if your CPU actually supports `amd_pstate`. Run: >> `grep -i cppc /proc/cpuinfo` >> If there's no `cppc` flag, your CPU or BIOS doesn't expose the required >> ACPI CPPC interface, and `amd_pstate` will refuse to load. >> > > cppc is present. > > >> 2. Check your BIOS settings. Look for options like "CPPC", "ACPI CPPC", >> or "Global C-state Control" and make sure they are enabled. >> >> 3. Check if the `amd_pstate` module is even available: >> `modinfo amd_pstate` >> If it says "not found", your Debian kernel might not have it compiled >> in for your CPU family. >> > > sudo modinfo amd_pstate > modinfo: ERROR: Module amd_pstate not found. > > >> >> If none of these work, your HP Pavilion might be too old for >> `amd_pstate`, and `acpi-cpufreq` is the only driver it can use. In that >> case, the "Performance" profile might simply not be supported by your >> hardware on Debian. >> >> Let me know what `grep -i cppc /proc/cpuinfo` shows. >> >> Hope this helps. >> >> >> ---- 回复的原邮件 ---- >> 发件人 Timothy M Butterworth<[email protected]> >> <[email protected]> >> 日期 2026年11月11日 13:50 >> 收件人 Angela Arch Linux<[email protected]> <[email protected]> >> 抄送至 heck-schneider<[email protected]> >> <[email protected]>、debian-user<[email protected]> >> <[email protected]> >> 主题 Re: Re: Re: Power Profiles not supported >> >> >> On Wed, Nov 11, 2026 at 12:24 AM Angela Arch Linux <[email protected]> >> wrote: >> >>> To add the parameter, just run this command in your terminal (no need to >>> use Vim): >>> >>> sudo sed -i >>> 's/GRUB_CMDLINE_LINUX_DEFAULT="/GRUB_CMDLINE_LINUX_DEFAULT="amd_pstate=active >>> /' /etc/default/grub >>> sudo update-grub >>> sudo reboot >>> >> >> I modified the GRUB command line as shown: >> >> GRUB_CMDLINE_LINUX_DEFAULT="amd_pstate=active quiet splash >> >> I updated GRUB and I still load acpi-cpufreq >> >> `cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver` >> bash: acpi-cpufreq: command not found >> >> >> >> >>> >>> ---- 回复的原邮件 ---- >>> 发件人 Timothy M Butterworth<[email protected]> >>> <[email protected]> >>> 日期 2026年11月11日 13:15 >>> 收件人 Angela Arch Linux<[email protected]> <[email protected]> >>> 抄送至 heck-schneider<[email protected]> >>> <[email protected]>、debian-user<[email protected]> >>> <[email protected]> >>> 主题 Re: Re: Power Profiles not supported >>> >>> >>> On Tue, Nov 10, 2026 at 10:49 PM Angela Arch Linux <[email protected]> >>> wrote: >>> >>>> Hi, >>>> >>>> Since you mentioned the same kernel works on Fedora, it's likely a >>>> missing >>>> power management daemon or firmware dependency in Debian. >>>> >>>> Try installing "thermald" (Intel) or "amd64-microcode" (AMD). >>>> Also, check if your CPU requires the specific P-State driver: >>>> >>> >>> I have: >>> amd64-microcode/testing,now 3.20260923.1 amd64 [installed] >>> Platform firmware and microcode for AMD CPUs and SoCs >>> >>> and >>> intel-microcode/testing,now 3.20260925.1 amd64 [installed] >>> Processor microcode firmware for Intel CPUs >>> >>> My processor is actually AMD. >>> >>> For PState I have: >>> librte-power-amd-pstate26/testing,now 25.11.4-1 amd64 [installed] >>> Data Plane Development Kit (librte-power-amd-pstate runtime library) >>> >>> sudo apt install thermald intel-microcode >>>> sudo systemctl enable --now thermald >>>> >>> >>> I installed thermald but it is not supported. >>> Nov 11 00:04:54 hp-pavilion.home.arpa systemd[1]: Starting >>> thermald.service - Thermal Daemon Service... >>> Nov 11 00:04:54 hp-pavilion.home.arpa thermald[33197]: Unsupported cpu >>> model or platform >>> >>> After rebooting, check if "Performance" appears in "powerprofilesctl >>>> list". >>>> >>>> Another possibility: Fedora might be loading a specific firmware that >>>> Debian >>>> keeps in "non-free-firmware". Check "dmesg | grep -i power" to see if >>>> the CPU is complaining about missing ACPI or thermal tables. >>>> >>> >>> sudo dmesg | grep -i power >>> [ 0.246664] thermal_sys: Registered thermal governor 'power_allocator' >>> [ 0.418642] ACPI: \_SB_.PCI0.GPP2.DEV0.PWRE: New power resource >>> [ 0.419128] ACPI: \_SB_.PCI0.GP17.XHC0.P0U0: New power resource >>> [ 0.419172] ACPI: \_SB_.PCI0.GP17.XHC0.P3U0: New power resource >>> [ 0.419434] ACPI: \_SB_.PCI0.GP17.XHC1.P0U1: New power resource >>> [ 0.419477] ACPI: \_SB_.PCI0.GP17.XHC1.P3U1: New power resource >>> [ 0.419741] ACPI: \_SB_.P0S0: New power resource >>> [ 0.419757] ACPI: \_SB_.P3S0: New power resource >>> [ 0.419802] ACPI: \_SB_.P0S1: New power resource >>> [ 0.419817] ACPI: \_SB_.P3S1: New power resource >>> [ 0.422872] ACPI: \_SB_.PRWL: New power resource >>> [ 0.429670] Low-power S0 idle used by default for system suspend >>> [ 0.448425] pci 0000:04:00.1: D0 power state depends on 0000:04:00.0 >>> [ 0.448434] pci 0000:04:00.3: extending delay after power-on from >>> D3hot to 20 msec >>> [ 0.448579] pci 0000:04:00.4: extending delay after power-on from >>> D3hot to 20 msec >>> [ 0.958457] PM: genpd: Disabling unused power domains >>> [ 1.122915] input: Power Button as >>> /devices/platform/PNP0C0C:00/input/input1 >>> [ 1.124077] ACPI: button: Power Button [PWRB] >>> [ 6.458155] sr 1:0:0:0: Power-on or device reset occurred >>> [ 24.492652] wlo1: Limiting TX power to 23 (23 - 0) dBm as advertised >>> by 18:a5:ff:1c:da:27 >>> >>> The only thing that stood out was: >>> [ 0.958457] PM: genpd: Disabling unused power domains >>> >>> Tim >>> >>> >>>> Hope this helps. >>>> >>>> >>>> ---- 回复的原邮件 ---- >>>> 发件人 Timothy M Butterworth<[email protected]> >>>> <[email protected]> >>>> 日期 2026年11月11日 08:50 >>>> 收件人 derlyne<[email protected]> <[email protected]> >>>> 抄送至 Debian User<[email protected]> >>>> <[email protected]> >>>> 主题 Re: Power Profiles not supported >>>> >>>> >>>> On Tue, Nov 10, 2026 at 7:26 AM derlyne <[email protected]> >>>> wrote: >>>> >>>>> The package to install to manage power profiles is >>>>> `power-profiles-daemon`. It provides the system service and the >>>>> `powerprofilesctl` command; the required dependencies are installed >>>>> automatically. >>>>> >>>>> sudo apt install power-profiles-daemon >>>>> sudo systemctl enable --now power-profiles-daemon >>>>> >>>> >>>> I already have this installed and running. >>>> >>>> To display and change profiles graphically, the interface depends on >>>>> your desktop environment: GNOME and KDE Plasma include this functionality >>>>> in their settings or power-management tools. You generally don’t need to >>>>> install a separate package if those components are already installed. >>>>> >>>> >>>> I have KDE. >>>> >>>> >>>>> >>>>> Check the detected profiles with: >>>>> >>>>> powerprofilesctl list >>>>> >>>>> >>>>> “Power Saver” and “Balanced” are normally available; “Performance” >>>>> depends on hardware support. >>>>> >>>> >>>> Performance shows up if I boot Fedora and I am able to switch the >>>> profiles from the system tray battery widget. Both Fedora and Forky have >>>> the 7.2 Linux kernel so it does not appear to be a kernel support issue. >>>> >>>> >>>>> (... gmail...) >>>>> >>>> >>>> >>>> -- >>>> ⢀⣴⠾⠻⢶⣦⠀ >>>> ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system >>>> ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/ >>>> ⠈⠳⣄⠀⠀ >>>> >>> >>> >>> -- >>> ⢀⣴⠾⠻⢶⣦⠀ >>> ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system >>> ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/ >>> ⠈⠳⣄⠀⠀ >>> >> >> >> -- >> ⢀⣴⠾⠻⢶⣦⠀ >> ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system >> ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/ >> ⠈⠳⣄⠀⠀ >> > > > -- > ⢀⣴⠾⠻⢶⣦⠀ > ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system > ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/ > ⠈⠳⣄⠀⠀ > -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/ ⠈⠳⣄⠀⠀
