Sto cercando di cambiare la frequenza della CPU sul mio laptop (con Linux) e non sto avendo successo.
Ecco alcuni dettagli:
# uname -a
Linux yoga 3.12.21-gentoo-r1 #4 SMP Thu Jul 10 17:32:31 HKT 2014 x86_64 Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz GenuineIntel GNU/Linux
# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 2.60 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.60 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 2.42 GHz (asserted by call to hardware).
(similar information for cpus 1, 2 and 3)
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
performance powersave
Inizialmente avevo il Governator dello spazio utente integrato nel kernel, ma poi ho anche provato a costruirlo come modulo (con gli stessi risultati); è stato caricato durante l'esecuzione dei comandi sopra (e non sono riuscito a trovare alcun messaggio di sistema durante il caricamento):
# lsmod
Module Size Used by
cpufreq_userspace 1525 0
(some other modules)
Ed ecco i comandi che ho provato per cambiare la frequenza:
# cpufreq-set -f 800MHz
Error setting new values. Common errors:
- Do you have proper administration rights? (super-user?)
- Is the governor you requested available and modprobed?
- Trying to set an invalid policy?
- Trying to set a specific frequency, but userspace governor is not available,
for example because of hardware which cannot be set to a specific frequency
or because the userspace governor isn't loaded?
# cpufreq-set -g userspace
Error setting new values. Common errors:
- Do you have proper administration rights? (super-user?)
- Is the governor you requested available and modprobed?
- Trying to set an invalid policy?
- Trying to set a specific frequency, but userspace governor is not available,
for example because of hardware which cannot be set to a specific frequency
or because the userspace governor isn't loaded?
Qualche idea?
echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo
e ho avuto un panico istantaneo del kernel: p Poi ho riavviatointel_pstate=disable
e ora sta usando acpi-cpufreq, ma non riesco ancora a impostare la frequenza (anche se non ricevo più messaggi di errore). A proposito, perché non fare una risposta al tuo commento?