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Date: Fri, 01 Jul 2011 09:10:33 +1000
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From: Peter Chubb <peter.chubb@nicta.com.au>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Chubb <peter.chubb@nicta.com.au>,
        Matthew Garrett <mjg59@srcf.ucam.org>, linux-kernel@vger.kernel.org
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Subject: Re: Acer Aspire One now hangs on reboot/shutdown
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>>>>> "H" == H Peter Anvin <hpa@zytor.com> writes:

H> On 06/22/2011 04:50 PM, Peter Chubb wrote:
>>>>>>> "Matthew" == Matthew Garrett <mjg59@srcf.ucam.org> writes:
>> 
Matthew> On Wed, Jun 22, 2011 at 08:38:08PM +1000, Peter Chubb wrote:
>>>> 
>>>> Hi Matthew, GIT commit 660e34cebf0a11d54f2d5dd8838607452355f321
>>>> x86: reorder reboot method preferences causes my Acer Aspire One
>>>> to hang on shutdown/reboot.
>> 
Matthew> Also, shutdown? Really?
>> 
>> Sorry, shutdown -r (which is reboot really).
>> 
>> 
>> Writing the reset value `6' to the reset port 3321 in single user
>> mode makes the screen go blank, and the machine to become totally
>> unresponsive.  The power light remains on.  But the machine does
>> *not* reboot.
>> 
>> I've put up the ACPI tables at
>> http://www.cse.unsw.edu.au/~peterc/AspireOneACPI
>> 
>> The relevant part of the FADT is: [074h 0116 12] Reset Register :
>> <Generic Address Structure> [074h 0116 1] Space ID : 01 (SystemIO)
>> [075h 0117 1] Bit Width : 08 [076h 0118 1] Bit Offset : 00 [077h
>> 0119 1] Access Width : 01 [078h 0120 8] Address : 0000000000000CF9
>> 
>> [080h 0128 1] Value to cause reset : 06
>> 

H> OK, so this machine is actively broken and needs a quirk.

H> Which "reboot=" options work on this machine?

b and k

t, p and a all result in a machine hang with the power light on, the
backlight off, and no apparent activity anywhere.

H> 	-hpa

H> --
Dr Peter Chubb                                  peter DOT chubb AT nicta.com.au
http://www.ertos.nicta.com.au               ERTOS within National ICT Australia
All things shall perish from under the sky/Music alone shall live, never to die
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