linux-kernel - Re: [Bugme-new] [Bug 8378] New: Averatec 3156X laptop doesn't reboot with kernels

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Message-Id: <20070512180240.7a8923d5.akpm@linux-foundation.org>
Date:	Sat, 12 May 2007 18:02:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lee Garrett <lee-in-berlin@....de>
Cc:	Truxton Fulton <trux@...xton.com>, linux-kernel@...r.kernel.org,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>
Subject: Re: [Bugme-new] [Bug 8378] New: Averatec 3156X laptop doesn't 
 reboot with kernels > 2.6.13.5 (responsible commit found)

On Sat, 12 May 2007 21:35:58 +0200 Lee Garrett <lee-in-berlin@....de> wrote:

> Truxton Fulton wrote:
> > Hi,
> > 
> > I verified on my IDEQ210M that performing the old reboot sequence
> > followed by the new reboot sequence works for me, and I suspect that
> > it will work for Lee also.  Like this :
> > 
> > 	/* old method, works on most machines */
> >         for (i = 0; i < 100; i++) {
> >                 kb_wait();
> >                 udelay(50);
> >                 outb(0xfe, 0x64);         /* pulse reset low */
> >                 udelay(50);
> >         }
> > 
> > 	/* new method, sets the "System flag" which when set,
> > 	   indicates successful completion of the keyboard controller
> > 	   self-test (Basic Assurance Test, BAT).  This is needed
> > 	   for some machines with no keyboard plugged in */
> >         for (i = 0; i < 100; i++) {
> >                 kb_wait();
> >                 udelay(50);
> >                 outb(0x60, 0x64);         /* write Controller Command Byte */
> >                 udelay(50);
> >                 kb_wait();
> >                 udelay(50);
> >                 outb(0x14, 0x60);         /* set "System flag" */
> >                 udelay(50);
> >                 kb_wait();
> >                 udelay(50);
> >                 outb(0xfe, 0x64);         /* pulse reset low */
> >                 udelay(50);
> >         }
> > 
> > Thanks,
> > 
> > -Truxton
> 
> Hello everyone,
> 
> I compiled a 2.6.21.1 kernel with Truxton's suggestion mentioned 
> above. My laptop reboots normally with it. For convenience I've 
> diffed a patch, which is appended to this mail.
> 

OK, thanks.

So that are we doing here?  We try the pre-Truxton code and if that didn't
work we try the post-Truxton code?  Hard to see how that could go wrong.

Truxton, can you please test it for us?
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