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Date: Sun, 09 Dec 2001 18:54:20 -0000
From: Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
Reply-To: Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
To: Alex Hudson <home@alexhudson.com>, linux-kernel@vger.kernel.org
Cc: Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
Subject: Re: APM woes: IBM T20 Thinkpad
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Alex,

--On Saturday, 08 December, 2001 11:20 PM +0000 Alex Hudson 
<home@alexhudson.com> wrote:

> I'm running a self-compiled Linux 2.4.16-pre1 on a IBM-T20, and am
> seeing problems with APM.
...
> If someone could point out some tests I could try to pin this down, or
> has some other suggestion, I would be very grateful.

This is what I did to try and get a T23 to work (which isn't
a T20, I know).

First upgrade your BIOS and/or system controller - available
FOC from the IBM web site.

If that doesn't fix it, try changing whether or not interrupts
are allowed during suspend. I think for a T20 they should *not*
be, but the T23 crashes if they are *not* (and needs it the
other way around). Don't just fiddle with the config option as
pci_quirks will override it. Either look at doing something like
  http://www.alex.org.uk/T23/T23-apm-patch.txt
or just frig the code yourself to force apm.allow_ints one way
or another.

--
Alex Bligh
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