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Date: Sat, 3 Apr 2010 16:19:11 GMT
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To: freebsd-acpi@FreeBSD.org
From: Dan Lukes <dan@obluda.cz>
Cc: 
Subject: Re: kern/145306: [acpi]: Can't change brightness on HP ProBook 4510s
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The following reply was made to PR kern/145306; it has been noted by GNATS.

From: Dan Lukes <dan@obluda.cz>
To: bug-followup@FreeBSD.org, demelier.david@gmail.com
Cc:  
Subject: Re: kern/145306: [acpi]: Can't change brightness on HP ProBook 4510s
Date: Sat, 03 Apr 2010 10:12:27 +0200

 The brightness change part of acpi-video is based on ACPI specification
 4.0 paragpraph B.7
 
 Maybe the notebook doesn't support it.
 
 The acpidump -dt may help.
 
 Also, it's necesarry to compile kernel with ACPI_DEBUG, then setup debug
 messages in loadr.conf, then check the BIOS will generate the required
 notifications.
 
 					Dan