Ok I did some investigating and on first boot, Fn+F5 works, after
suspend and hibernate, it doesn't.

So I looked at (eventually) the ACPI values in /proc/acpi/ibm/hotkey

On first boot the value is set to: enable,0xffffff

After resuming from suspend or hibernation the value had been changed to
0xffff8f

If I then executed:

# echo enable,0xffffff >/proc/acpi/ibm/hotkey

It then worked again.

So I tracked down the 0xffff8f value to come from
/etc/modprobe.d/thinkpad_acpi.modprobe which had the line:

options thinkpad_acpi hotkey=enable,0xffff8f experimental=1

I've changed this now to 0xffffff and it works now.

What would 0xffff8f mean? Why has this been done. Can anyone else say
with a T40, T41, T42, T43 or other Tx series confirm that the symptoms
described here are indeed the case and that whether this fixes it for
them? If so, this might need to be put into a Gutsy bug fix?

Certainly did for me. Just need to figure out why sometimes wireless
does not work sometimes after resuming from suspend/hibernate and that's
all my Ubuntu T40 bugs squashed :)

Vicky

-- 
Fn F5 Does not Switch off Wifi in Gutsy - Thinkpad T40 Regression
https://bugs.launchpad.net/bugs/158634
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