linux-kernel - Re: Regression: Linux 2.6.31-rc7 lost sensors on asus mobo

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Message-ID: <4A8FCE50.9070801@s5r6.in-berlin.de>
Date:	Sat, 22 Aug 2009 12:54:08 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Gene Heskett <gene.heskett@...izon.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression: Linux 2.6.31-rc7 lost sensors on asus mobo

Robert Hancock wrote:
> On 08/21/2009 09:09 PM, Gene Heskett wrote:
>>  From messages when I attempt to access the it87:
>> Aug 21 22:59:37 coyote kernel: [  572.507928] it87: Found IT8716F chip at 0x290, revision 1
>> Aug 21 22:59:37 coyote kernel: [  572.507937] it87: in3 is VCC (+5V)
>> Aug 21 22:59:37 coyote kernel: [  572.507939] it87: in7 is VCCH (+5V Stand-By)
>> Aug 21 22:59:37 coyote kernel: [  572.508232] ACPI: I/O resource it87 [0x295-0x296] conflicts with ACPI region IP__ [0x295-0x296]
>> Aug 21 22:59:37 coyote kernel: [  572.508234] ACPI: Device needs an ACPI driver
...
> The ACPI AML on your machine indicates that the BIOS may attempt to 
> access the it87 hardware, and the kernel now by default blocks it87 from 
> requesting those ports as it may conflict with what the BIOS is trying 
> to do. On some machines, the ACPI BIOS accesses hardware monitoring 
> chips itself to manage ACPI thermal zones, etc. and the conflicting 
> access can cause incorrect temperature readings and other bad behavior.
> 
> You can try acpi_enforce_resources=lax on the kernel command line to 
> restore the previous behavior. Or for some Asus boards, you can try the 
> asus_atk0110 ACPI driver instead of it87.

PS:  There have been previous reports, e.g. those logged as 
http://bugzilla.kernel.org/show_bug.cgi?id=13967
-- 
Stefan Richter
-=====-==--= =--- =-==-
http://arcgraph.de/sr/
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