Problem waking Thinkpad G40 from S3 suspend to RAM

[Sudhakar Chandra <thaths-Xioq7UEg2g9MLo7UitmB5A@public.gmane.org>]

Hi,

I have Debian (unstable) installed on my Thinkpad G40.  I have a 
hand-compiled kernel 2.6.8.1 (patched with bootsplash, ACPI and swsusp2 
patches from 10 days ago) that I am using. Most drivers are compiled as 
modules except for framebuufer, bootsplash, swsusp2, etc.

I am able to hibernate my laptop (i.e. suspend to disk) fine using 
swsusp2. I am also able to suspend my laptop to RAM just fine (passing 
acpi_mode=s3_bios to kernel). My problem is waking up from an S3 suspend 
to RAM sleep.  When suspended, the "sliver / crescent moon" LED comes on 
indicating that the laptop is sleeping.  When I close the lid and reopen 
it, the laptop tries to wake up and I hear a beep.  But nothing shows up 
on the display. The crescent moon LED is also no longer illuminated. I 
know that the laptop has woken up because at this stage I can press the 
power button and initiate a swsusp2 suspend.  When I restart I am able 
to wake up the state that was suspended to disk.

My questions:

1. Has anyone got waking up from S3 suspend to work properly on a G40? 
If so, how?

2. I upgraded to the latest BIOS on IBM's support site. If this BIOS is 
still broken, I guess I need to upgrade my DSDT table. Unfortunately, 
the documentation I read refers me to an iasl compiler that I cannot 
find at the indicated site:
http://developer.intel.com/technology/iapc/acpi/downloads.htm

3. Is there a way to invoke swsusp2 on S4 suspend?

I tried my experiements above with only acpi modules loaded and nothing 
else in single usermode (with pcmcia, usb, etc., unloaded).

Thanks.

Thaths
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