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Date: Tue, 15 Nov 2011 07:57:23 +0100
From: Sebastian Chmielewski <chmiels@o2.pl>
To: Alexander Motin <mav@FreeBSD.org>
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Cc: current <current@freebsd.org>
Subject: Re: Second SATA device lost after ZFS root is mount
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On Tue, 15 Nov 2011 01:43:21 +0200
Alexander Motin <mav@FreeBSD.org> wrote:

> explicitly disabled. I have only one crazy idea: while setting screen 
> brightness you are calling ACPI code that is black box by definition and 
> can do whatever it wants with hardware, including using any possible 
> custom power control interfaces.
You are right, sequence of 

sudo sysctl dev.acpi_ibm.0.lcd_brightness=6; sudo sysctl dev.acpi_ibm.0.lcd_brightness=3

causes device disconnect:

ahcich1: DISCONNECT requested
ahcich1: AHCI reset...
ahcich1: SATA connect timeout time=10000us status=00000000
ahcich1: AHCI reset: device not found
(ada1:ahcich1:0:0:0): lost device
(pass1:ahcich1:0:0:0): lost device
(pass1:ahcich1:0:0:0): removing device entry

best regards,
-- 
Sebastian Chmielewski * jid:chmielsster@gmail.com * gg:3336919 * icq:224161389