Bonjour,
Le ventilo tournant en permanence avec une température de 58° au repos, je viens d’installer phc-k8, version AMD, sur mon HP Probook, par DKMS.
Mais je ne comprends pas très bien comment l’utiliser. Ci-après un extrait du readme :
[code]2. Usage:
The PHC K8 driver uses “fid” instead of a frequency and “vid” instead of voltage. This is because that is what is used internally by AMD processors. To convert between frequency and fid you can use:
frequency = 800MHz + (100MHz * fid)
fid = (frequency/100MHz) - 8
To convert between voltage and vid, you will need to know what processor you have. To calculate the voltage you should probably use “millivolts = 1550 - 25vid" for desktop processors and "millivolts = 1450 - 25vid” for mobile processors. (Probably, because this is not well documented by AMD.)
E.g.:
AMD X2 processor:
vid = 16 => voltage = 1550 - 25 * 16 = 1150mV
Vid = 24 => voltage = 1550 - 25 * 24 = 950mV
Turion 64 processor:
vid = 4 => voltage = 1450 - 25 * 4 = 1350mV
Vid = 22 => voltage = 1450 - 25 * 22 = 900mV
The phc-k8 driver can be used in two modes:
a) Native powernow-k8 mode (the default).
b) Relaxed powernow-k8 mode with direct transitions enabled (using “direct_transitions=1” as module option for the phc-k8 driver)
2.a Native powernow-k8 mode:
In native powernow-k8 mode, the voltages for each fid can be changed. This can be done either by using phc_vids or phc_controls in /sys/devices/system/cpu/cpu/cpufreq/. The default vids can always be found in phc_default_vids, the default controls in phc_default_controls
E.g.:
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_vids
4 6 22
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_controls
10:4 8:6 0:22
~# echo ‘10 14 24’ > /sys/devices/system/cpu/cpu0/cpufreq/phc_vids
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_vids
10 14 24
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_controls
10:10 8:14 0:24
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_default_vids
4 6 22
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_default_controls
10:4 8:6 0:22
2.b Relaxed powernow-k8 mode with direct transitions enabled:
In “direct transitions” mode, not only the vids can be changed, but the available frequencies as well. Especially for Laptop owners, this is really great! In fact, any frequency between the maximum frequency of the processor down to its minimum can be used, with steps of 100MHz. By default, only the frequencies supported by default are enabled. “Direct transitions” technically mean that during frequency transitions the driver jumps straight to the new frequency, instead of applying an algorithm to move gradually towards it. This enables the driver to choose any fid the processors’ minimum and the processors’ maximum.
Look into /sys/devices/system/cpu/cpu/cpufreq/phc_available_fids to see what fids are available in either mode.
To change the sets of frequencies/voltages, the best interface to use is:
/sys/devices/system/cpu/cpu/cpufreq/phc_controls
E.g.:
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_controls
10:4 8:6 0:22
~# echo ‘10:10 8:14 2:22 0:24’ > /sys/devices/system/cpu/cpu0/cpufreq/phc_controls
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_controls
10:10 8:14 2:22 0:24
~# cat /sys/devices/system/cpu/cpu0/cpufreq/phc_default_controls
10:4 8:6 0:22[/code]
Je ne trouve pas de fichier phc_default_vids.
J’ai cru comprendre qu’il faut connaître le modèle exact du processeur, et HP me donne l’embarras du choix dans la description de la bécane :
Type de processeur
Processeur AMD Turion™ II Ultra Dual-Core Mobile M620 (2,5 GHz, 2 Mo de mémoire cache L2) ou processeur AMD Turion™ II Ultra Dual-Core Mobile M600 (2,4 GHz, 2 Mo de mémoire cache L2) ou processeur AMD Turion™ II Dual-Core Mobile M540 (2,4 GHz, 1 Mo de mémoire cache L2) ou processeur AMD Turion™ II Dual-Core Mobile M520 (2,3 GHz, 1 Mo de mémoire cache L2) ou processeur AMD Athlon™ II Dual-Core M340 (2,2 GHz, 1 Mo de mémoire cache L2) ou processeur AMD Athlon™ II Dual-Core M320 (2,1 GHz, 1 Mo de mémoire cache L2) ou processeur AMD Sempron™ M120 (2,1 GHz, 512 Ko de mémoire cache L2) ou processeur AMD Sempron™ M100 (2,0 GHz, 512 Ko de mémoire cache L2)
