Bug 14760

Summary: "AVIVO: disable dithering on DFPs" introduces color banding. (xf86-video-ati)
Product: xorg Reporter: Brian <btatehome>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: 7.3 (2007.09)   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
lvds panels may require dithering none

Description Brian 2008-02-29 15:17:10 UTC 
The commit named "AVIVO: disable dithering on DFPs"(46547ae8bdbc5c10f1fd028b95ec4c5c31a5b318  I believe) on xf86-video-ati introduced improper color output on my LVDS display. 

A gradient image, will show discrete bands going from the start color to the end color. 

That's the commit I traced it back to; The problem is on the current git as well. 

Chip: R500 x1400 mobility on a Dell e1505. 

Thanks.
Comment 1 Alex Deucher 2008-02-29 15:27:29 UTC 
Created attachment 14725 [details] [review]
lvds panels may require dithering

Does this patch fix it?
Comment 2 Brian 2008-02-29 15:59:41 UTC 
Yes works great. 

Thanks for the fix.
Comment 3 Alex Deucher 2008-02-29 19:36:52 UTC 
pushed: b069aadaa63a95d7a71b5cfbab83577b49501094

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