Undervolt PHC option
shanestone
Status: New User - Welcome
Joined: 16 Jul 2021
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Hi i am new to undervolting. Currently using Linux Mint XFCE 20.2 and would like to try to undervolt the cpu.

Got introduce to Liquorix kernel because they said it enable by default.

Anyway how to use the phc-intel function cos i could not find the phc at /sys/devices/sstem/cpu/cpu*/cpufreq

CPU
q9450

and
Mobile T4200
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techAdmin
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Joined: 26 Sep 2003
Posts: 4034
Location: East Coast, West Coast? I know it's one of them.
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past inxi -bCxz so we can see the system data.
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shanestone
Status: New User - Welcome
Joined: 16 Jul 2021
Posts: 3
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:: Code ::
$ inxi -bCxz
System:
  Kernel: 5.4.0-74-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
  Desktop: Xfce 4.16.0 Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal
Machine:
  Type: Desktop System: Hewlett-Packard
  product: HP Compaq dc7800 Convertible Minitower v: N/A serial: <filter>
  Mobo: Hewlett-Packard model: 0AACh serial: <filter> BIOS: Hewlett-Packard
  v: 786F1 v01.35 date: 10/23/2015
CPU:
  Topology: Quad Core model: Intel Core2 Quad Q9450 bits: 64 type: MCP
  arch: Penryn rev: 7 L2 cache: 6144 KiB
  flags: lm nx pae sse sse2 sse3 sse4_1 ssse3 vmx bogomips: 21278
  Speed: 2660 MHz min/max: 1998/2667 MHz Core speeds (MHz): 1: 2660 2: 1995
  3: 1995 4: 2664
Graphics:
  Device-1: AMD Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]
  vendor: PC Partner Limited driver: radeon v: kernel bus ID: 01:00.0
  Display: x11 server: X.Org 1.20.9 driver: ati,radeon
  unloaded: fbdev,modesetting,vesa resolution: 2560x1600~60Hz
  OpenGL: renderer: AMD VERDE (DRM 2.50.0 5.4.0-74-generic LLVM 11.0.0)
  v: 4.5 Mesa 20.2.6 direct render: Yes
Network:
  Device-1: Intel 82566DM-2 Gigabit Network vendor: Hewlett-Packard
  driver: e1000e v: 3.2.6-k port: 2100 bus ID: 00:19.0
Drives:
  Local Storage: total: 111.79 GiB used: 8.79 GiB (7.9%)
Info:
  Processes: 206 Uptime: 3m Memory: 7.70 GiB used: 1.02 GiB (13.2%)
  Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17
  inxi: 3.0.38

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techAdmin
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/sys/devices/sstem/cpu/cpu*/cpufreq is hopefully not what you typed, should be:

/sys/devices/system/cpu/cpu*/cpufreq
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damentz
Status: Assistant
Joined: 09 Sep 2008
Posts: 914
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Liquorix doesn't have the PHC patches and I've never applied them. The patches themselves look invasive and can alter the behavior of users that never intended to undervolt. Here's an example: gitlab.com/linux-phc/phc-intel/-/blob/master/inc/5.8/linux-phc-0.4.0.patch

Also, the developer of this patch never properly used git to track changes, making it a nightmare and a huge liability to include into Liquorix (and Zen Kernel as an extension). By keeping the changes in patch form, maintainers lose access to the metadata in git (ancestor commit ID), we'd normally have to forward port on every major linux update.

Small things like this are important and it's a shame the author never maintained the patches optimally. Fortunately today on modern Intel processors, we have throttled, where you can undervolt and specify the package power limit. The daemon works well and I use it today to get more battery life on my work and personal laptops.

As for your system, you're on your own. Arch linux has a wiki that you can try following, but the commands you need to run will be different on Linux Mint: wiki.archlinux.org/title/PHC
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shanestone
Status: New User - Welcome
Joined: 16 Jul 2021
Posts: 3
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i'd again by downloading the zip on this site https://gitlab.com/linux-phc/phc-intel

and it work using liquorix kernel 5.12.0-19.1-liquorix-amd64

can see now phc at /sys/devices/system/cpu/cpu0/cpufreq/phc-control

anyway on "throttled" app you'd mention does it work with core 2 duo or core 2 quad intel cpu. i just need an app that work iwth both c2d and c2q intel to udervolt the cpu voltage.

do you know other than phc-intel that can undervolt intel core 2 duo and intel core 2 quad cpu?
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techAdmin
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Location: East Coast, West Coast? I know it's one of them.
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:: Quote ::
As for your system, you're on your own

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