CONFIG_X86_INTEL_PSTATE disables CPU frequency transition stats,many governors and other standard features

From: Artem S. Tashkinov
Date: Sat Apr 27 2013 - 01:08:27 EST


Just wanted to let everyone know that CONFIG_X86_INTEL_PSTATE wreaks
havoc with the CPU frequency subsystem in the Linux kernel.

With this option enabled:

1) All governors except performance and powersave are gone, ondemand
userspace, conservative

2) scaling_cur_freq is gone, thus user space utilities monitoring the CPU
frequency have stopped working

3) CPU frequency transition stats are gone, there's no "stats" directory

4) scaling_available_frequencies is gone, so I cannot set the desired constant
CPU frequency (the userspace governor is not available anyway)

Is this an intended behavior? I shrivel to think that's the case.

The bug report is filed here:

Best regards,

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