https://bugzilla.kernel.org/show_bug.cgi?id=57141

           Summary: CONFIG_X86_INTEL_PSTATE disables CPU frequency
                    transition stats and many governors
           Product: ACPI
           Version: 2.5
    Kernel Version: 3.9
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Power-Processor
        AssignedTo: acpi_power-proces...@kernel-bugs.osdl.org
        ReportedBy: t.ar...@mailcity.com
                CC: torva...@linux-foundation.org
        Regression: Yes


Created an attachment (id=100011)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100011)
3.9 configuration

Without CONFIG_X86_INTEL_PSTATE

1) I can see frequency transition stats
2) I can use userspace, ondemand and conservative governors
3) I can see the current cores frequencies using
/sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq

This option/driver disables *everything* mentioned above.

Is this an intended behavior?

Of course, it's nice to finally see Turbo Frequencies in the ACPI driver but
what about the rest?

This option also breaks all user space utilities.

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