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    SubjectRe: [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS
    Ack. Let's just do this. Ingo?

    Linus

    On Wed, Jul 13, 2011 at 1:44 PM, Len Brown <lenb@kernel.org> wrote:
    >
    >> So how about informing users, how about making it non-silent? An informative
    >> printk that also mentions the power configuration tool, etc. This solves the
    >> concerns i mentioned.
    >
    > Something like this?
    >
    >                rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
    >                if ((epb & 0xF) == 0) {
    >                        printk_once(KERN_WARN, "x86: updated energy_perf_bias"
    >                                " to 'normal' from 'performance'\n"
    >                                "You can view and update epb via utility,"
    >                                " such as x86_energy_perf_policy(8)\n");
    >                        epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
    >                        wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
    >                }
    >
    >
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