From owner-freebsd-mobile@FreeBSD.ORG  Wed Apr 16 09:26:36 2008
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Date: Wed, 16 Apr 2008 18:27:30 +0900
From: Takashi Inoue <takash-i@sophia.ac.jp>
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Subject: Re: setting dev.acpi_ibm.0.events at boot time
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Alberto Rizzi wrote:

> I read somewhere that Xorg bypass these values, and so you can't change 
> the brightness with that sysctl.
> Under xorg, for my T61, I use x11/xbacklight

Thanks for the information. I'll try it from now.

I can change the brightness using sysctl by hand in x-term after login.
However, /etc/sysctl.conf has no effect on ttyv8.
Moreover, I see sometimes inconsistency between the value and actual 
brightness, after several change of ttyv#.

T Inoue