From owner-freebsd-mobile@FreeBSD.ORG  Wed Apr 16 11:48:54 2008
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Date: Wed, 16 Apr 2008 20:49:49 +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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> 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#.

I've tried xbacklight. It works perfectly.
No need to be root. It's great!
I'll not use lcd_brightness more.

T. Inoue