kern/145306: [acpi]: Can't change brightness on HP ProBook 4510s
Dan Lukes
dan at obluda.cz
Sat Apr 3 16:19:12 UTC 2010
The following reply was made to PR kern/145306; it has been noted by GNATS.
From: Dan Lukes <dan at obluda.cz>
To: bug-followup at FreeBSD.org, demelier.david at 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
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