I'm having a nasty amount of corruption on DG965WH, Linux 2.6.33.2, xorg-server 
1.8.0, Mesa 7.8, libdrm 2.4.20.  The same with 1.7.6 and 7.7 works fine.  All 
built from release tarballs and unmodified (except a two-line backport of 
symbols KMS_BO_TYPE_CURSOR_64X64_A8R8G8B8 and KMS_BO_TYPE_SCANOUT_X8R8G8B8 to 
get 7.7 to compile against 2.4.19/20).

Most things are okay.  I am experiencing a lot of corruption on vertical 
scrolling; some rectangular areas of the display don't redraw.  This is 
particularly ugly when editing a source file, because I am never sure where I 
am clicking or selecting.  It is most noticeable on a small scroll such as you 
get with the scroll wheel.  I see it also when scrolling a web page in a 
browser.  It tends to be reproducible if you scroll down and then up one scroll 
wheel click.  If I bring up a .jpg in the browser, I get some rectangular areas 
where the image is white.  If I then do a "back" and "forward" to get it 
redrawn, it is completely drawn.  I know this is not the best description, but 
I am looking for guidance on where to look first.

I have had to revert this to 1.7.6/7.7 in order to keep working, but if anyone 
has an idea which component it is, I could do some bisecting; unless someone 
has an aha! moment and can solve it just from the description.
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