Bug 52941

Summary: CPU recognition bug for AMD
Product: Power Management Reporter: Sogn (sognametal)
Component: cpufreqAssignee: cpufreq
Status: CLOSED PATCH_ALREADY_AVAILABLE    
Severity: normal CC: lenb
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.7.4-1-ARCH Subsystem:
Regression: No Bisected commit-id:

Description Sogn 2013-01-23 12:59:02 UTC
Hi.

Since the 3.7.3 kernel, the cpu recognition bug [AMD Phenom II X4 965 Black Edition @ 3.4 GHz].

-> /etc/conf.d/cpupower :
governor='ondemand'
min_freq="0.80GHz"
max_freq="3.39GHz"

-> cpupower frequency-info
analyse du CPU 0 :
  pas de pilotes cpufreq reconnu pour ce CPU
  boost state support:
    Supported: no
    Active: no

My cpu is no longer recognized and freq stay stuck at max.

But, after a few minutes (more than 20) or a few hours my cpu is again recognized...
-> cpupower frequency-info
analyse du CPU 0 :
  pilote : acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 4.0 us.
  limitation matérielle : 800 MHz - 3.40 GHz
  plage de fréquence : 3.40 GHz, 2.70 GHz, 2.20 GHz, 800 MHz
  régulateurs disponibles : ondemand, performance
  tactique actuelle : la fréquence doit être comprise entre 800 MHz et 3.40 GHz.
                  Le régulateur "ondemand" est libre de choisir la vitesse
                  dans cette plage de fréquences.
  la fréquence actuelle de ce CPU est 3.40 GHz.
  boost state support:
    Supported: no
    Active: no
Comment 1 Sogn 2013-01-30 18:34:23 UTC
Fixed with last kernel upgrade (3.7.5).