Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754602AbcCNEb6 (ORCPT ); Mon, 14 Mar 2016 00:31:58 -0400 Received: from mga02.intel.com ([134.134.136.20]:4772 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750866AbcCNEb4 (ORCPT ); Mon, 14 Mar 2016 00:31:56 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,334,1455004800"; d="scan'208";a="669025377" From: "Brown, Len" To: Andy Lutomirski , "linux-kernel@vger.kernel.org" Subject: RE: C1E auto-promotion suspend/resume Thread-Topic: C1E auto-promotion suspend/resume Thread-Index: AQHRfZJi8xmR3UOP0E2W34l+wWpPvZ9YWX4w Date: Mon, 14 Mar 2016 04:31:36 +0000 Message-ID: <1A7043D5F58CCB44A599DFD55ED4C94846A12FBC@fmsmsx115.amr.corp.intel.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.1.200.108] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id u2E4W4sd026370 Content-Length: 513 Lines: 17 > 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