Toshiba Portege 4000 - keyboard is lost every second reboot

[Andrey Borzenkov <arvidjaar-JGs/UdohzUI@public.gmane.org>]

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I have old P4000 that I intended to install Linux on; I switched it on a 
couple of times after I got it just see if it works at all. Then I booted Mdk 
10.2 (Mandriva LE2005) install CD to see how it would detect devices (the 
point of interest was WiFi) and suddenly after reboot keyboard was dead (it 
did not respond to any keypress even during normal "Press F12 for boot 
menu"). I had to switch it off to reboot again.

Currently this has WinXP SP2. After playing around a bit I suddenly discovered 
the same issue under Windows as well. Every second reboot keryboard is "lost" 
- I can use mouse to reboot and keyboard is back again. After switching it 
off keyboard was always present.

Being curious I reconfigured Windows to for normal (non-ACPI) PC - and the 
problem went away (well, apparently P4000 does not support APM so it is 
possible even switch off in this mode). So the problem is apparently 
ACPI-related. Also during reboot it behaves quite diferently - with ACPI OS 
it looks like P4000 is switched off and later on.

Anybody has seen it before? It will run Linux that is the reason I ask here; I 
looked for DSDT but none for P4000; any idea what could cause it and how to 
debug?

TIA

-andrey

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