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

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Date:	Tue, 02 Oct 2007 19:30:27 -0700
From:	Truxton Fulton <trux@...xton.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Hiroto Shibuya" <hiroto.shibuya@...il.com>
Cc:	Lee Garrett <lee-in-berlin@....de>, linux-kernel@...r.kernel.org,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, ak@...e.de, torvalds@...l.org
Subject: Re: [Bugme-new] [Bug 8378] New: Averatec 3156X laptop doesn't  reboot with kernels > 2.6.13.5 (responsible commit found)

Andrew Morton wrote (at Sat, 12 May 2007 18:02:40 -0700) :
> 
> 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?

Hi,

Hiroto Shibuya wrote to tell me that he has a VIA EPIA-EK10000
which suffers from the reboot problem when no keyboard is attached.
My first patch works for him :

  http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=59f4e7d572980a521b7bdba74ab71b21f5995538

But the latest patch does not work for him :

  http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8b93789808756bcc1e5c90c99f1b1ef52f839a51

We found that it was necessary to also set the "disable keyboard"
flag in the command byte, as the first patch was doing.  The
second patch tries to minimally modify the command byte, but
it is not enough.

Please consider this simple one-line patch to help people with
low end VIA motherboards reboot when no keyboard is attached.
Hiroto Shibuya has verified that this works for him (as I
no longer have an afflicted machine) :

This patch is against linux-2.6.23-rc9/include/asm-i386/mach-default/mach_reboot.h

--- mach_reboot.h       Mon Oct  1 20:24:52 2007
+++ mach_reboot.h.new   Tue Oct  2 19:22:13 2007
@@ -49,7 +49,7 @@
                udelay(50);
                kb_wait();
                udelay(50);
-               outb(cmd | 0x04, 0x60); /* set "System flag" */
+               outb(cmd | 0x14, 0x60); /* set "System flag" and "Keyboard Disabled" */
                udelay(50);
                kb_wait();
                udelay(50);


Thanks,

-Truxton
-
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