Radeon M7 rendering problem for SXGA+

[Alex Deucher]

On 10/18/06, John Klingler <john at jupiter.com> wrote:
> The ATI Radeon M7 BLTs require screen width to be an even multiple of 64
> bytes, otherwise the pitch is wrong. For example, when moving a window,
> the window contents appear as diagonal artifacts on the root window.
>
> For screen widths that are not multiples of 64, for example 1400
> (SXGA+), ATI says they think setting the surface width to the next
> greater multiple of 64 should correct this. I didn't see any way to do
> that and am still awaiting a reply. In the meantime, I use the cfb blits
> for this situation. (The problem also occurs when the resolution is
> 800x600x8Bpp. )
>
> Does anyone know how to get the M7 accelerated blits to work in cases
> such as this?
>

You just need to set the pitch of the drawing engine to the correct
alignment.  Most modern GPUs have similar requirements.  This should
already be handled.  Are you using the xorg radeon driver?

Alex

>
> Thanks,
>
> John Klingler
> P.S. This problem affects all the M7 rendering functions, e.g. lines
> etc., not just the blits.
>