To provide some more info:
-- I have was using this same hardware setup with redhat 7.3 without these problems, so I suspect it's an XFree problem. I did notice an occasional "shimmering" effect underRH 7.3, but that's about the only oddness I had.
-- It is not app specific. The link below shows a dramatic example (black background on a web page rendered by Mozilla seems to be a particular problem), but the setup is actually quite usable most of the time. The usual symptom is that there is a little "streaking" of faint vertical lines sometimes. Moving windows around manually or redrawing makes things better (or at least different).
Does this sound like a bad memory issue?
Mike A. Harris wrote:
On Tue, 22 Apr 2003, Mike Godfrey wrote:
Date: Tue, 22 Apr 2003 22:06:10 -0400 From: Mike Godfrey <migod@xxxxxxxxxxxx> To: xfree86-list@xxxxxxxxxx Cc: mharris@xxxxxxxxxx Content-Type: text/plain; charset=us-ascii; format=flowed Subject: Re: Redhat 9, ATI Radeon 7500, DVI digital display -- output flaky
Here is a screenshot of what I was talking about; thanks for any tips.
http://plg.uwaterloo.ca/~migod/ftp/radeon-dvi-output.jpg
Hmm. that looks like bad video memory corrupting offscreen pixmap cache.
To test that theory, please try adding to the device section of your config file:
Option "noaccel"
Restart X and try to reproduce. If the problem persists, and is static and not changing, not influenced at all by moving windows around, etc. then it is probably video memory corruption right in the framebuffer.
If noaccel makes the problem go away, it could be offscreen video memory corruption as mentioned above. You can test this out by removing option noaccel, and instead trying each of these one at a time, then both together:
Option "XaaNoOffscreenPixmaps" Option "XaaNoPixmapCache"
Indicate if either one work, both, or neither.
It also could be some kind of Xft or RENDER wonkiness, although that would be reproduceable on any hardware and shouldn't be driver or card specific in that case, and would be widely reported.
It's also possible to be an application specific problem although from the screenshot it seems unlikely.
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