From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760106AbbKTMXx (ORCPT ); Fri, 20 Nov 2015 07:23:53 -0500 Received: from mx2.suse.de ([195.135.220.15]:35076 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751159AbbKTMXw (ORCPT ); Fri, 20 Nov 2015 07:23:52 -0500 Subject: Re: Hibernate resume bug around 3,18-rc2 - Full PAT support To: vasvir@iit.demokritos.gr References: <564CF10E.6000905@iit.demokritos.gr> <564D6090.9020604@suse.com> <564D91ED.4090403@suse.com> <564E32A4.7010406@iit.demokritos.gr> <564EAEB3.4000107@iit.demokritos.gr> <564EDE0C.9060002@suse.com> <30cf6b91068d178445adac701fe49c79.squirrel@webmail.iit.demokritos.gr> Cc: linux-kernel@vger.kernel.org, Toshi Kani , "Luis R. Rodriguez" From: Juergen Gross X-Enigmail-Draft-Status: N1110 Message-ID: <564F10D5.3090309@suse.com> Date: Fri, 20 Nov 2015 13:23:49 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <30cf6b91068d178445adac701fe49c79.squirrel@webmail.iit.demokritos.gr> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 20/11/15 11:04, vasvir@iit.demokritos.gr wrote: >> I've just found a potential issue: In case MTRR is disabled by the BIOS >> the PAT register of the boot processor won't be restored after resume. >> >> Can you check whether pr_info("MTRR: Disabled\n") has been executed in >> early boot? If yes, this might be a BIOS option. >> > > I don't have access right now. I will test it later tonight (This is my > home machine). > > Would $dmesg | grep -i mtrr suffice or I need to look for the mtrr > somewere else e.g. /proc /sys etc? I think grepping for MTRR in dmesg should be enough. Juergen