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Date: Fri, 5 Apr 2002 08:39:54 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
Reply-To: root@chaos.analogic.com
To: Arnvid Karstad <arnvid@karstad.org>
cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Problems rebooting from linux to windows...
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On Fri, 5 Apr 2002, Arnvid Karstad wrote:

> Hi, 
> 
> recently I've seen a few problems with several laptops and if one are so 
> unfortunate that one needs to reboot into Windows after a session in linux.
> Normal restart of windows never have a problem on the same machines, but if 
> you go from Linux to for instance Windows by shutdown -r or reboot it will 
> freeze half way into the booting process. 
> 
> A power cycle will hower fix this. 
> 
> Anyone got an idea about where to start looking? 
> 
> Best regards 
> 
> Arnvid Karstad

I have this same problem on my Compaq Presario. I think that this
is because the BIOS was shadowed and used some writable-RAM somewhere.
Linux seems to do a 'warm-boot'. The result being that some of the
stuff that the BIOS counts on was wiped out by Linux, i.e.,
stuff from E000:0000 -> E000:FFFF (the BIOS is normally at F000:0000).

My 'fix' is to cold-boot, i.e., processor reset during the shutdown.


Cheers,
Dick Johnson

Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).

                 Windows-2000/Professional isn't.

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