No colors @ Svideo @ i915

Marco marcodefreitas at
Mon Mar 19 02:11:12 PDT 2007

Dirk Thierbach escreveu:
> On Sun, Mar 18, 2007 at 09:57:51PM +0100, Krzysztof Halasa wrote:
>> "Ahmad M. Hisham" <ahmadmhisham at> writes:
>>> I have an output SVideo and TV input is composite so i use a converter.
>>> Everything is OK at the laptop but on the TV the screen is BW image.
>> This is normal :-(
>> S-Video is two signals: chroma (color info) and luminance (B&W image).
>> Your "converter" (which converts only physical plug shape) takes only
>> luminance and completely ignores chrominance.
> Depends on the converter: There are also converters which couple 
> the chrominance signal to the luminance signal with a capacity and 
> produce a perfect composite signal.
> There are many reasons for getting no color: Broken cable, broken
> converter, broken color carrier generation in the encoder chip
> (some Chrontels do that), wrong assignment of signals to pins.
> Possible fixes on the software side can include reprogramming the
> signal assignments of the encoder chip (composite instead of
> luminance), or in some cases changing the color carrier frequency to a
> "wrong" value which nevertheless works. Assuming that the encoder
> chip is known well enough to be actually able to reprogram it.
> Without more details, it's hard to pinpoint the reason.
> - Dirk
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> xorg mailing list
> xorg at
Take care about color standards too: PAL, SECAM, NTSC.

Marco de Freitas,
NBR para a Internet já! Porque meu navegador não é penico.

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