From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7AC17C6778C for ; Thu, 5 Jul 2018 09:50:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F3972403B for ; Thu, 5 Jul 2018 09:50:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2F3972403B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753410AbeGEJuP (ORCPT ); Thu, 5 Jul 2018 05:50:15 -0400 Received: from mx2.suse.de ([195.135.220.15]:47794 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753070AbeGEJuO (ORCPT ); Thu, 5 Jul 2018 05:50:14 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 18F1CACCF; Thu, 5 Jul 2018 09:50:13 +0000 (UTC) Date: Thu, 05 Jul 2018 11:50:11 +0200 Message-ID: From: Takashi Iwai To: "Rafael J. Wysocki" Cc: "Rafael J. Wysocki" , Thomas =?UTF-8?B?SMOkbmln?= , Linux PM , Linux Kernel Mailing List Subject: Re: [REGRESSION 4.17] Spurious wakeup / reboot with power button In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 05 Jul 2018 11:34:59 +0200, Rafael J. Wysocki wrote: > > Hi, > > On Thu, Jul 5, 2018 at 9:05 AM, Takashi Iwai wrote: > > Hi, > > > > we've got a regression report since 4.17 about the behavior of > > power-off with the power button. When a machine is powered off with > > the power button on desktop, it reboots after a few seconds instead of > > power down. > > > > The manual power down via "systemctl poweroff" works fine, so it's > > possibly some spurious wakeup by the power button action, and some > > ACPI-related change is suspected. > > The regression still remains in 4.18-rc3. > > There are only a few ACPI commits directly related to power management > between 4.16 and 4.17 and none of them looks particularly suspicious. OK, interesting. > It looks like the power button state may not be cleared sufficiently > after it's been pressed which is now visible for some reason. Hmm, where can such a state remain? Since it happens after the machine turned off, some (ACPI) wakeup bits? > How does the button poweroff work, exactly? I guess the event is > collected by a user space demon which then triggers power of via sysfs > or similar? Usually X desktop environment receives an input event from the ACPI power button input device, and deals the event accordingly depending on the setup. The power-down behavior itself should be equivalent with "systemctl poweroff" or such. thanks, Takashi