From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752190AbbJBKJB (ORCPT ); Fri, 2 Oct 2015 06:09:01 -0400 Received: from mail.linuxsystems.it ([2.119.245.41]:58964 "EHLO mail.linuxsystems.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752015AbbJBKI7 convert rfc822-to-8bit (ORCPT ); Fri, 2 Oct 2015 06:08:59 -0400 X-Greylist: delayed 543 seconds by postgrey-1.27 at vger.kernel.org; Fri, 02 Oct 2015 06:08:57 EDT From: =?iso-8859-1?Q?Niccol=F2_Belli?= To: Cc: Subject: [Dell XPS 13 9343] Random kernel Oops at boot with =?iso-8859-1?Q?"acpi=3Dht",_disappearing_with_"acpi=3Doff"?= Date: Fri, 02 Oct 2015 11:59:38 +0200 User-Agent: Trojita/0.5; Qt/4.8.7; X11; Linux; Arch Linux MIME-Version: 1.0 Message-ID: <16367d85-fe84-4792-819a-d50a508409ef@linuxsystems.it> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, This laptop suffers of random kernel hangs at boot: I tested kernel 4.1.8, 4.2.1 and 4.3-rc3 and they are all affected. Every time I turn on my laptop I have to boot several times to be able to reach the sddm login because often I get hangs which prevent the system to boot. Once booted I don't have any problem anymore, until the next boot. With "acpi=off" the system boots flawlessly, while with "acpi=ht" I still get random hangs, so I guess the problem is in the ACPI table parsing code itself, or perhaps the SMP code. I recompiled kernel 4.3-rc3 with CONFIG_ACPI_DEBUG=y and I attached full log from a serial console, booting with "debug acpi.debug_level=0x2003" (warn, error and tables debug enabled): https://bugzilla.kernel.org/attachment.cgi?id=189041 Distro is Arch Linux. Please let me know if you need further logs. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=105251 Niccolò Belli