From owner-freebsd-bugs  Sat Aug 12  9:47:33 2000
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Date: Sat, 12 Aug 2000 17:47:28 +0100
From: Josef Karthauser <joe@pavilion.net>
To: freebsd-bugs@FreeBSD.ORG
Subject: Re: kern/20375: APM doesn't work properly! Suspend/resume/suspend/hang
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References: <200008111230.FAA68279@freefall.freebsd.org>
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In-Reply-To: <200008111230.FAA68279@freefall.freebsd.org>; from joe@pavilion.net on Fri, Aug 11, 2000 at 05:30:09AM -0700
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On Fri, Aug 11, 2000 at 05:30:09AM -0700, Josef Karthauser wrote:
>  
>  I believe that it broke sometime in the last couple of months.
>  
>  If I could get a trace that'd find the culprit, but unfortunately
>  the machine hangs hard - power reset required.  Maybe some debug
>  output to stderr would catch the problem.  Is there somewhere in
>  the bus code that I can add some debug that'll show each device
>  being suspended?
>  

Ok, more updates.

There _is_ a sysctl (debug.apm_debug) recently added for debugging.

Using the kernel debugger I've determined that the freeze is almost
definitely in the bios32 call:

	apm_do_suspend
	    apm_suspend_system
	        apm_bioscall
		    bios32
			HANG

This happens on the second suspend only, the first time through it
succeeds, and returns after a resume event (keypress, etc.).

Who's our APM wizard?  I've no idea what the bios interaction should
be.

Joe


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