According to the article, they don't support arbitrary horizontal scaling; they're only supporting output of a 960x1080 frame at 1920x1080 (note that 960 is half of 1920). I'd be willing to bet money they came up with some sort of hardware trick that halves the speed at which the output is generated from the framebuffer.
This isn't scaling so much as it is horizontal line doubling.
It would also explain why it only works horizontally and not vertically.
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mirobin @ Jan 26th 2007 7:33PM
According to the article, they don't support arbitrary horizontal scaling; they're only supporting output of a 960x1080 frame at 1920x1080 (note that 960 is half of 1920). I'd be willing to bet money they came up with some sort of hardware trick that halves the speed at which the output is generated from the framebuffer.
This isn't scaling so much as it is horizontal line doubling.
It would also explain why it only works horizontally and not vertically.