Message-ID: <5461FD97.1080601@gmail.com>
Date: Tue, 11 Nov 2014 07:14:15 -0500
From: Austin S Hemmelgarn <ahferroin7@gmail.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0
MIME-Version: 1.0
To: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        "H. Peter Anvin" <hpa@zytor.com>
CC: Matthew Garrett <mjg59@srcf.ucam.org>,
        =?ISO-8859-1?Q?Pali_Roh=E1r?= <pali.rohar@gmail.com>,
        Matt Fleming <matt.fleming@intel.com>, Borislav Petkov <bp@alien8.de>,
        Mark Salter <msalter@redhat.com>,
        Alessandro Zummo <a.zummo@towertech.it>, rtc-linux@googlegroups.com,
        linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Dave Young <dyoung@redhat.com>
Subject: Re: [PATCH] rtc: Disable EFI rtc for x86
References: <1412339576-17972-1-git-send-email-matt@console-pimps.org>	<20141109182231.GA29337@pd.tnic>	<1415618533.14686.239.camel@mfleming-mobl1.ger.corp.intel.com>	<201411101723.49197@pali>	<5460EB92.1090501@gmail.com>	<20141110170417.GA17286@srcf.ucam.org>	<5461220E.20605@gmail.com>	<546126FF.3070600@zytor.com> <20141111113831.1119720e@alan.etchedpixels.co.uk>
In-Reply-To: <20141111113831.1119720e@alan.etchedpixels.co.uk>
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On 2014-11-11 06:38, One Thousand Gnomes wrote:
>>> look further into the options I have set in my kernel build, I may ha=
ve
>>> changed something else without remembering between booting with and
>>> without the CSM enabled.
>>>
>>
>> It could also be that the non-CSM BIOS somehow remaps the CMOS registe=
rs.
>
> I don't believe there is anything which prevents the CSM from faking a
> CMOS clock using SMM from whatever is actually in the hardware.
>
> Alan
>
It wouldn't surprise me if that were the case.  I've had some pretty=20
weird firmware related issues with other Lenovo systems before (like the =

brightness hot-keys causing the reported trip points for ACPI thermal=20
zones to temporarily change).

I've rebuilt the kernel I'm using with everything I can think of=20
possibly depending on the CSM compiled out or as modules, so I'll=20
hopefully have some more info soon.


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