linux-kernel - Re: [PATCH 4.19 025/361] ACPICA: AML interpreter: add region addresses in global list during initialization

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Message-ID: <341e972a-d941-f44e-73b9-926ac6cf0ccf@applied-asynchrony.com>
Date:   Mon, 12 Nov 2018 20:41:59 +0100
From:   Holger Hoffstätte <holger@...lied-asynchrony.com>
To:     "Schmauss, Erik" <erik.schmauss@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Jean-Marc Lenoir <archlinux@...emel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 4.19 025/361] ACPICA: AML interpreter: add region
 addresses in global list during initialization

Hello Erik,

thanks for responding.

On 11/12/18 8:01 PM, Schmauss, Erik wrote:
>> As probably expected this patch causes problems. In my case one server can
>> no longer load the nct6775 hwmon module, which means the fan cannot be
>> monitored, and therefore my monitoring system promptly starts spamming
>> me with alerts that my fan has failed - which is of course not true.
>>
>> --snip--
>> Nov 12 18:08:56 tux kernel: nct6775: Found NCT6776D/F or compatible chip at
>> 0x2e:0x290 Nov 12 18:08:56 tux kernel: ACPI Warning: SystemIO range
>> 0x0000000000000295-0x0000000000000296 conflicts with OpRegion
>> 0x0000000000000290-0x Nov 12 18:08:56 tux kernel: ACPI: If an ACPI driver is
>> available for this device, you should use it instead of the native driver
>> --snip--
>>
>> This is certainly caused by my old BIOS and its broken ACPI implementation,
>> however since it's working perfectly fine otherwise I see no reason to
>> replace it. That being said, I must be able to monitor my fan, so for now
>> reverting the patch immediately "fixed" the problem for me - the fan entries
>> appeared in sysfs again after successfully loading the module.
>>
>> Idea, workarounds or patches welcome.
> 
> Is there a firmware update available for this machine? If so, you may want to do
> a firmware update.

The motherboard is from 2011 and I already installed the last available
BIOS from 2013 a few years ago. That fixed exactly nothing. :)
This was my last motherboard from Asus ever, but alas, it's still here
and otherwise working, so..

> Also, what is the behavior in kernels 4.16 or older?

Everything just worked - yes, with ACPI spew, but.. ¯\(ツ)/¯
I understand that the patch might well be "technically correct" and OK
for mainline/current hardware and will try playing with acpi=.. kernel
flags.

thanks,
Holger