Re: [PATCH]: EDID parser

On Thu, Apr 03, 2003 at 05:15:32PM +0100, Alan Cox wrote:

On Iau, 2003-04-03 at 18:10, Sven Luther wrote:

quoted

It has two outputs, where i can hook either a DVI or a VGA monitor. Each
of these video outputs correspond to a viewport, and there is hardware
which will let you set the output timings and the dot clock. You also
have to configure which part of the framebuffer you are reading, and
eventually setup a scaller to scale the pixels you read to the correct
output buffer. You also have for each head a DDC/I2C bus you can use to
speak with the monitor.

Very common except lower end stuff generally has a single frame buffer
that both show and cannot be split or scanned by multiple outputs at
different rates.

So, using the terminology of Petr's graph, you have only one CRTC, with
two possible outputs, or maybe you have two CRTC but which needs to be
synchronized between them ?

Friendly,

Sven Luther


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