From: "Timothy A. Seufert" <tas@mindspring.com>
To: "Kevin B. Hendricks" <khendricks@ivey.uwo.ca>,
linuxppc-dev@lists.linuxppc.org
Subject: Re: How to control Brightness for Flat Panels?
Date: Sun, 18 Nov 2001 13:28:57 -0800 [thread overview]
Message-ID: <p05101000b81dd161fddc@[10.0.0.42]> (raw)
In-Reply-To: <20011118174724.HJSA24249.tomts11-srv.bellnexxia.net@there>
At 12:50 PM -0500 11/18/01, Kevin B. Hendricks wrote:
>Hi,
>
>How do we go about controlling "brightness" for Flat Panels? Is this
>functionality in the radeonfb.c or the XFree86 code?
>
>The new Apple FlatPanels has no manual brightness knob or control so it
>must be done in software.
>
>Ideas anyone?
For Apple's monitors this might actually happen through USB. ADC has
it, and it would be a handy data path to use for such commands. The
fact that MacOS 9 has a "USBAppleMonitorModule" extension and MacOS X
has "AppleUSBDisplays.kext" is suggestive.
If it is in fact USB, you could probably write a userspace program
(using libusb) without touching XFree86 or radeonfb at all. The
tough part would be deciphering the protocol. (Pretty easy if you
have a USB protocol analyzer to watch what MacOS does.)
--
Tim Seufert
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2001-11-18 21:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-18 17:50 How to control Brightness for Flat Panels? Kevin B. Hendricks
2001-11-18 21:28 ` Timothy A. Seufert [this message]
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