From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mario Limonciello Subject: Re: [PATCH] ACPI / blacklist: blacklist Win8 OSI for Dell Inspiron 7437 Date: Wed, 20 May 2015 12:42:14 -0500 Message-ID: <555CC776.3030802@dell.com> References: <1429759476-13186-1-git-send-email-alex.hung@canonical.com> <20150424082115.GA3783@srcf.ucam.org> <20150427174646.GA22664@srcf.ucam.org> <20150428052448.GA3458@srcf.ucam.org> <20150428171100.GA24599@srcf.ucam.org> <5554F12A.3010003@dell.com> <20150514191358.GB23853@srcf.ucam.org> <5554F4B2.8080801@dell.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from ausxippc101.us.dell.com ([143.166.85.207]:1063 "EHLO ausxippc101.us.dell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753033AbbETRmR (ORCPT ); Wed, 20 May 2015 13:42:17 -0400 In-Reply-To: <5554F4B2.8080801@dell.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Matthew Garrett Cc: Alex Hung , Linux ACPI Mailing List On 05/14/2015 02:17 PM, Mario Limonciello wrote: > > On 05/14/2015 02:13 PM, Matthew Garrett wrote: >> On Thu, May 14, 2015 at 02:02:02PM -0500, Mario Limonciello wrote: >> >>> * Battery information was not displayed in the OS. The BIOS team >>> found that the Linux wasn't asking for battery information in the OS >>> in the same way that Windows does. The delta path creates a SMI >>> event to get battery information. >> Huh. Is there any chance we can find out what the difference is so we >> can make them equivalent? >> > That was my reaction too. I'm asking for some technical details on this. Hi Matthew, I've gotten some more information on this. Windows: Asks for battery information update multiple times. Linux: Only asks once for battery information update. The net result is that on Linux ACPI battery is missing. In the _REV test BIOS workaround, a SMI event was added to ask for battery information update. Thanks,