linux-kernel - Re: Acer Aspire One now hangs on reboot/shutdown

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Message-ID: <4E0CC06E.7040204@zytor.com>
Date:	Thu, 30 Jun 2011 11:29:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Chubb <peter.chubb@...ta.com.au>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, linux-kernel@...r.kernel.org
Subject: Re: Acer Aspire One now hangs on reboot/shutdown

On 06/22/2011 04:50 PM, Peter Chubb wrote:
>>>>>> "Matthew" == Matthew Garrett <mjg59@...f.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
> 

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

Which "reboot=" options work on this machine?

	-hpa
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