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

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Date:	Sat, 12 May 2007 21:35:58 +0200
From:	Lee Garrett <lee-in-berlin@....de>
To:	Truxton Fulton <trux@...xton.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	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)

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.

Regards,
Lee

View attachment "reboot-fix.patch" of type "text/x-patch" (1583 bytes)