linux-kernel - Re: [RFT] x86 acpi: normalize segment descriptor register on resume

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Date:	Mon, 14 Jul 2008 08:14:30 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...ealbox.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	public-kernel-testers-u79uwXL29TY76Z2rM5mHXA@...gmane.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume

On Sun 2008-07-13 22:22:06, Henrique de Moraes Holschuh wrote:
> On Sun, 13 Jul 2008, Andi Kleen wrote:
> > It probably switches to protected mode. I noticed this on my old
> > Fujitsu laptop when I tried to make the S3 wakeup run in the s2ram x86 emulator
> > and found it entered protected mode at some point, which x86emu
> > didn't support.
> > 
> > I guess Lenovo is doing the same.
> > 
> > And that protected mode code relies on some GDT values that have been
> > loaded earlier when the BIOS also went into protected mode.
> > 
> > It seems the BIOS programmers really don't like real mode anymore.
> > Somehow understandable.
> 
> If it were just Lenovo, it shouldn't be too difficult to get them to fix the
> BIOS.  But since other vendors have the same problem, that won't fly as a
> solution.

With all the BIOSes in field, practically impossible to update? (My
x60 has no CDrom..) No, I don't think we can expect fix from BIOS vendors.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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