Radeon M7 rendering problem for SXGA+

John Klingler john at jupiter.com
Wed Oct 18 10:44:15 PDT 2006

I am not using the xorg radeon driver but I have been going through the code
to see how this is handled. As far as I have been able to determine, the
driver does not support SXGA+. I will look again. (Can you give me a hint?)



Alex Deucher wrote:

> 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.

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