* How to control Brightness for Flat Panels?
@ 2001-11-18 17:50 Kevin B. Hendricks
2001-11-18 21:28 ` Timothy A. Seufert
0 siblings, 1 reply; 2+ messages in thread
From: Kevin B. Hendricks @ 2001-11-18 17:50 UTC (permalink / raw)
To: linuxppc-dev
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?
Thanks,
Kevin
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to control Brightness for Flat Panels?
2001-11-18 17:50 How to control Brightness for Flat Panels? Kevin B. Hendricks
@ 2001-11-18 21:28 ` Timothy A. Seufert
0 siblings, 0 replies; 2+ messages in thread
From: Timothy A. Seufert @ 2001-11-18 21:28 UTC (permalink / raw)
To: Kevin B. Hendricks, linuxppc-dev
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/
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2001-11-18 17:50 How to control Brightness for Flat Panels? Kevin B. Hendricks
2001-11-18 21:28 ` Timothy A. Seufert
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