RE: C1E auto-promotion suspend/resume

From: Brown, Len
Date: Mon Mar 14 2016 - 00:32:03 EST

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> By BIOS (1.2.3 on a Dell XPS 13 9350) seems to want to enable C1E
> auto-promotion (ugh!), which results in this difference across
> suspend/resume according to turbostat:
>
> -cpu3: MSR_IA32_POWER_CTL: 0x0024005d (C1E auto-promotion: DISabled)
> +cpu3: MSR_IA32_POWER_CTL: 0x0024005f (C1E auto-promotion: ENabled)
>
> Should intel_idle learn to re-disable idle promotion on resume?

Yes, it seems that way.

Go ahead and send a patch, or file a bug at bugzilla.kernel.org
and we'll get to it.

thanks,
-len

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