On Wed, Jul 16, 2008 at 10:08:25AM +0100, Stuart Morris wrote:
> It's my understanding that it is the pixel rate that
> is doubled to meet the minimum bandwidth requirement
> of 25Mpixels/sec for hdmi.
> That is pixels are repeated hence doubling the
> apparent horizontal resolution.
> This is always the case for the 480i and 576i modes.
> The modeline you need should be based on standard
> EIA/CEA-861B timings like this:
> # 1440x576i @ 50Hz (EIA/CEA-861B)
> ModeLine "1440x576" 27.000 1440 1464 1590 1728 576 581
> 587 625 -hsync -vsync Interlace
> Unfortunately I think there is a special flag that
> must be set to indicate pixel-repetition is being used
> and I am not sure how you would get a graphics card to
> do this.
> I have not tried using the above modeline so I cannot
> comment on whether it works.
> Worth a try though.
> There is a good list of EIA/CEA-861B modes here:
> I do know the 720p modeline works on my tv.
> GTF timings generally don't work for hdmi.
> The other issue with interlaced modes is how are the
> odd/even fields synchronised?
> Is this the same problem with interlaced output on a
> good old vga output?
I'd like to know this too.. to be able to get 1:1 interlaced
output, fields in sync like in the original stream.
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