From owner-freebsd-stable@FreeBSD.ORG  Wed Jan 16 03:33:48 2008
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Date: Wed, 16 Jan 2008 14:04:39 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Norberto Meijome <freebsd@meijome.net>
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Cc: FreeBSD Stable ML <freebsd-stable@freebsd.org>
Subject: Re: Kernel panic when kldunload acpi_video
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On Wed, 16 Jan 2008, Norberto Meijome wrote:
 > Hi guys,
 > I am not sure if this is acpi related or due to other issues.
 > 
 > running latest FreeBSD (built yesterday from fresh sources :
 > 
 > FreeBSD ayiin.xxx.com.au 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #14:
 > Wed Jan 16 01:38:57 EST 2008
 > root@ayiin.xxx.com.au:/usr/obj/usr/src/sys/AYIIN i386
 > 
 > Hardware is Thinkpad z60m , 1.5 GB of RAM. dmesg (non verbose) is @
 > end of this mail
 > 
 > I had :
 > 
 > Id Refs Address    Size     Name
 >  1   30 0xc0400000 63b77c   kernel
 >  2    1 0xc0a3c000 84a0     linprocfs.ko
 >  3    3 0xc0a45000 28878    linux.ko
 >  4    1 0xc0a6e000 10328    if_iwi.ko
 >  5    1 0xc0a7f000 155c4    snd_hda.ko
 >  6    2 0xc0a95000 4a36c    sound.ko
 >  7    2 0xc0ae0000 6a184    acpi.ko
 >  8    1 0xc0b4b000 4ff4     acpi_ibm.ko
 >  9    1 0xc0b50000 2f338    iwi_ibss.ko
 > 10    1 0xc0b80000 2f4b0    iwi_monitor.ko
 > 11    1 0xc0bb0000 22c98    radeon.ko
 > 12    2 0xc0bd3000 10e98    drm.ko
 > 13    1 0xc4b22000 d000     ipfw.ko
 > 14    1 0xccd23000 2000     rtc.ko
 > 
 > PLUS acpi_video.ko loaded in /boot/loader.conf.local.
 > 
 > doing a kldunload acpi_video would panic the kernel. Also happened in
 > single user. 
 >
 > I have crash dumps, but unfortunately, i wiped the kernel.debug after
 > starting a full clean rebuild of kernel + world for today's changes. 
 > 
 > I don't know whether this problem happened before 7 - i only started
 > loading acpi_video for a few weeks when I realised I couldn't change
 > the brightness on the screen anymore when under X (works ok in a
 > vconsole) 

Beto, hi,

not to detract from the seriousness of the problem, two dumb questions: 

1) why would you need to unload it?  ie did loading it fix the problem?

2) does this mean the acpi_ibm brightness controls aren't working in X?

cheers, Ian