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

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.


-- 
Mike A. Harris     ftp://people.redhat.com/mharris
OS Systems Engineer - XFree86 maintainer - Red Hat



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