linux-kernel - Re: Patch needed for ASUS EEEPC 701 2.6.27 (perhaps a regession)

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Message-ID: <48F46289.5050508@tuffmail.co.uk>
Date:	Tue, 14 Oct 2008 10:12:41 +0100
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	Alexey Starikovskiy <aystarik@...il.com>
CC:	Alan Jenkins <aj504@...dent.cs.york.ac.uk>,
	Pavel Machek <pavel@...e.cz>, Robert Goldner <robert@...79.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux acpi <linux-acpi@...r.kernel.org>,
	linux-stable@...r.kernel.org
Subject: Re: Patch needed for ASUS EEEPC 701 2.6.27 (perhaps a regession)

Alexey Starikovskiy wrote:
> Alan Jenkins wrote:
>> It could be a coincidence. But it's suspicious enough to advise
>> caution. We know what the bug is, and we have a very nice workaround
>> queued up now. There's no reason to test any more of these specific
>> systems to destruction :).
>> I did try re-installing off the vendor DVD and it was still broken. 
>> I fear I bought it from the wrong place to get sympathetic
>> _frontline_ support / warrantee.  I'm not interested in RMA back to
>> Asus - too much work and downtime for a cheap system, when I have an
>> easy workaround.  I haven't noticed any problems with "noapic".
>>
>>
>> The symptoms strongly suggest overflow in an event buffer or counter
>> maintained by the Embedded Controller.  So the EC firmware may have a
>> bug, of the sort that results in "unspecified behaviour".  A bug in a
>> special purpose (read: not subject to wide testing) subsystem which
>> has direct connections to things like frequency and voltage control.
>>
>> Hopefully I'm wrong, and I don't really know what I'm talking about
>> here.
>>
>> Regards
>> Alan
>>   
> Did you try to disconnect all power resources (e.g. AC adapter and all
> batteries and wait for some time)?

Yes, I tried leaving it with AC + battery unplugged overnight.

> May be there are some default settings in the BIOS?
> This looks small enough to be a HW failure...

I also upgraded the BIOS to the latest version.  And tried the BIOS
setup option to restore defaults.  Maybe there is some more state, but
it's not like a desktop where I can easily remove the CMOS battery.

Thanks
Alan
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