In message <20030129210022.X330@cargo-cult.k.bsd.de>, Christoph Badura writes:
>Hi,
>
>I have a new T30 thinkpad that locks up hard when left idle for a while.
>Or when I try to switch off the display (Fn-F3) or enter suspend mode (Fn-F4)
>from the keyboard.  Has anyone else seen this too?
>
>I've tried APM_DISABLE_INTERRUPTS=0 in the kernel config file and various
>of the other APM related options, including APM_NO_V12, all to no avail.
>
>I've tried 1.6.1_RC1 kernels from yesterday and -current from today.
>Both with the same result.
>
>When it locks up, it doesn't respond to keyboard presses, and the fxp0
>stops responding, too.  Of course, I can't enter DDB.
>
>The only intersting thing I've noticed in the kernel messages when
>booting with apmdebug=0xff is that it apparently wants a 64K datasegment
>starting at 0x400.
>
>The BIOS is the latest version 2.01.

Is the machine trying to auto-suspend?  Check the BIOS settings on that.

Greg Troxel said (I think) that turning off PCI bus power saving helped.
Oddly enough, I've been seeing hangs on my T21 recently -- since IBM 
replaced the motherboard.  I'm running 1.6; having the machine crash 
every few days is a novel experience; NetBSD just doesn't do that!
But that setting may be the clue.  I had had it disabled, since that 
was necessary to make the sound card work right.  These days, though, I 
build customs without the sound card, because there's a boot and resume 
bug that often results in hangs.  So -- and since I was having some 
battery lifetime issues on the new motherboard -- I left that setting 
enabled.  I wonder if that's related to the hangs I've seen.

I've disabled the option again; I'll see what happens.  Of course, it's 
non-deterministic, so it will be a few weeks at least before I'm 
confident that it's gone.

		--Steve Bellovin, http://www.research.att.com/~smb (me)
		http://www.wilyhacker.com (2nd edition of "Firewalls" book)