From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Feix Subject: intel_idle.max_cstate=1 required on baytrail to prevent crashes Date: Thu, 17 Mar 2016 08:05:25 +0100 Message-ID: <56EA5735.1060109@feix.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: Received: from smtp-out3.iol.cz ([194.228.2.91]:43978 "EHLO smtp-out3.iol.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753979AbcCQH01 (ORCPT ); Thu, 17 Mar 2016 03:26:27 -0400 Received: from port5.iol.cz (port5.iol.cz [192.168.30.95]) by smtp-out3.iol.cz (Postfix) with ESMTP id B308C38741 for ; Thu, 17 Mar 2016 08:05:52 +0100 (CET) Received: from [172.16.0.214] (81-174-51-163.v4.ngi.it [81.174.51.163]) by smtp.feix.cz (Postfix) with ESMTPSA id E3FC2111004A for ; Thu, 17 Mar 2016 08:05:26 +0100 (CET) Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linux-pm@vger.kernel.org Hello everyone, for the past few months, I'm fighting random hard lock-ups on my Baytrail machine with different linux kernels. Freezes are quite frequent, between few minutes to few hours of uptime. According to other reporters, this was pinpointed as an intel_idle problem on Baytrail. The bug report originally started as i915 regression at https://bugs.freedesktop.org/show_bug.cgi?id=88012 and was moved to kernel Bugzilla few months ago - https://bugzilla.kernel.org/show_bug.cgi?id=109051 This bug seems to be a serious showstopper for Baytrail users and was already confirmed by many, but there is no obvious progress on this bug report for last few months. Meny reporters have confirmed intel_idle.max_cstate=1 or intel_idle.max_cstate=2 as a half-working workaround, which makes the interval between freezes on Baytrail longer. Could someone here please confirm if this is in or out of anyone's current focus? I strongly believe this is not a minority issue and maybe this just slipped through meny other important bug reports. Thank you, -- Michael