Bug 945

Summary:	Horizontal lines or screen flicker with a high resolution DVI display
Product:	xorg	Reporter:	Christer Weinigel <christer>
Component:	Driver/Radeon	Assignee:	Xorg Project Team <xorg-team>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	high	CC:	oakad
Version:	6.7.0
Hardware:	x86 (IA32)
OS:	Linux (All)
URL:	http://www.ati.com/support/infobase/3992.html
Whiteboard:
i915 platform:		i915 features:

Description Christer Weinigel 2004-07-29 09:36:23 UTC

I'm seeing a lot of glitches when using a Radeon 9200 (RV280) or Radeon 9600
(RV350 AQ) card with a ViewSonic VP201b TFT monitor at 1600x1200x60Hz.
ATI has noted this as item #3992 in their infobase, and have added a workaround
to the Catalyst 02.3 Driver "Reduce DVI frequency on high-resolution displays".

Is it possible to implement the same workaround in the Xorg radeon driver?

I've done a quick diff between the Fedora Core 2 source for xorg-x11-6.7.0-5
that I'm using and the head of the xorg CVS tree, and did not see any obvious
changes related to the DVI frequency.  The new option "DynamicClocks" seem to
only affect the on-chip clocks and not the DVI frequency.

This bug may be related to bug #724.

Comment 1 Adam Jackson 2004-07-29 10:27:02 UTC

*** Bug 724 has been marked as a duplicate of this bug. ***

Comment 2 Alexander Dubov 2004-07-30 09:03:14 UTC

(In reply to comment #0) 
This bug is not exactly the duplicate of the bug 724 that I posted. In my case 
the problems were apparent on lower resolutions and ATI workaround had a very 
little effect on the image quality. 
Nowadays I have Radeon 9600 board (from Asus) in exactly the same setup and it 
has no problems at all (so the problem is in the hardware, presumably).

Comment 3 Constantine Sapuntzakis 2005-03-13 15:04:49 UTC

Well, I only see this problem at high resolutions. I have implemented a
workaround, but it involves disabling part of the radeon driver and adding
ModeLine. You can read more at
http://suif.stanford.edu/~csapuntz/rv280-linux-dvi.html

Comment 4 T. Hood 2005-09-23 09:53:24 UTC


*** This bug has been marked as a duplicate of 1129 ***

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