From: Peter Clifton <pcjc2@cam.ac.uk>
To: emisca <emisca.ml@gmail.com>
Cc: xorg@lists.freedesktop.org, linux-acpi@vger.kernel.org
Subject: RE: i810, mergedfb and lid switch and acpi video
Date: Wed, 17 Jan 2007 14:23:39 +0000 [thread overview]
Message-ID: <1169043819.6273.10.camel@localhost> (raw)
In-Reply-To: <1C601A6A3344064EB423D0C1E83B717BE6FD77@pdsmsx411.ccr.corp.intel.com>
SORRY - sent back to Luming by mistake - meant to send to all.
On Wed, 2007-01-17 at 12:20 +0800, Yu, Luming wrote:
> But there is NO _BQC. Instead of _BQC, there do have a _BCQ in DSDT.
> Is this a bug of BIOS? Acpi video drvier needs _BQC to get the
> current brightness level, and to get the next level to set on
receiving
> notification of 0x86 (Increase Brightness) , 0x87 (decrease
Brightness).
I can ACK that my HP had a similar typo / feature with its intel based
video:
00:02.0 VGA compatible controller: Intel Corporation Mobile
945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)
The _BQC is absent, but a strange _BCQ is there - which looks to give
the correct functionality.
The ONLY place I can find any reference to _BCQ is in a couple of
Windows Vista design documents about making display brightness work with
Vista.
Thank you Microsoft, for that typo - presuming thats what it is!
Peter Clifton
next prev parent reply other threads:[~2007-01-17 14:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <414cba4e0701150039j27d5ffcaw78e31e4119779872@mail.gmail.com>
2007-01-17 4:20 ` i810, mergedfb and lid switch and acpi video Yu, Luming
2007-01-17 14:23 ` Peter Clifton [this message]
2007-01-17 15:08 ` emisca
[not found] <200701120312.53809.lenb@kernel.org>
2007-01-15 6:01 ` Yu, Luming
2007-01-11 20:07 emisca
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