Re: Redhat 9, ATI Radeon 7500, DVI digital display -- output flaky

Thanks for the tips.  My daughter was born last night (!!), so it may 
take several days before I am able to test these ideas on my office machine.

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 <[email protected]>
>>To: [email protected]
>>Cc: [email protected]
>>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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