linux-kernel - RE: C1E auto-promotion suspend/resume

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Message-ID: <1A7043D5F58CCB44A599DFD55ED4C94846A12FBC@fmsmsx115.amr.corp.intel.com>
Date:	Mon, 14 Mar 2016 04:31:36 +0000
From:	"Brown, Len" <len.brown@...el.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: C1E auto-promotion suspend/resume

> 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