Bug 31203

Summary: [HD 2400 XT] iMac has wavy lines on the screen
Product: xorg Reporter: Vasyl Demin <vasyl.demin>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED INVALID QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: vasyl.demin
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
xorg.conf
none
Xorg.0.log
none
lspci -vnn
none
video bios
none
dmesg none

Description Vasyl Demin 2010-10-28 08:46:00 UTC 
Computer: iMac 8,1 20"
Video: ATI Radeon HD 2400 XT
OS: Arch Linux x86_64
xorg-server: 1.9.0

The display has a strange moiré-like effect (picture looks "instable", like the surface of disturbed water), that is not present under MacOS 10.5.

There are light vertical wavy floating lines visible on the screen. They are more clearly seen when you look the screen at an angle, from down below you look upwards to the screen. The floating lines can be precisely seen on grey backgrounds. These lines are not noticable much, but when you closely look with grey backgrounds, they are visible.

The problem is observed on the different drivers:
xf86-video-ati 6.13.2 (with or without KMS)
catalyst 10.10
vesa 2.3.0
Comment 1 Vasyl Demin 2010-10-28 08:47:04 UTC 
Created attachment 39866 [details]
xorg.conf
Comment 2 Vasyl Demin 2010-10-28 08:52:14 UTC 
Created attachment 39867 [details]
Xorg.0.log
Comment 3 Vasyl Demin 2010-10-28 08:54:29 UTC 
Created attachment 39868 [details]
lspci -vnn
Comment 4 Vasyl Demin 2010-10-28 08:59:47 UTC 
Created attachment 39869 [details]
video bios
Comment 5 Vasyl Demin 2010-10-28 09:06:58 UTC 
I've tried different resolutions, but it did not help.
Comment 6 Alex Deucher 2010-10-28 09:25:28 UTC 
What kernel are you using?  Can you attach your dmesg output?  Does booting with radeon.new_pll=0 on the kernel command line help?
Comment 7 Vasyl Demin 2010-10-29 02:26:59 UTC 
Alex, thanks for fast reply!

I'm using the 2.6.35.7 kernel.
Comment 8 Vasyl Demin 2010-10-29 02:27:53 UTC 
Created attachment 39882 [details]
dmesg
Comment 9 Vasyl Demin 2010-10-29 02:45:54 UTC 
I booted with "radeon.new_pll=0" and later with "nomodeset radeon.new_pll=0", but nothing helped.
Comment 10 Adam Jackson 2018-06-12 19:09:56 UTC 
Mass closure: This bug has been untouched for more than six years, and is not
obviously still valid. Please reopen this bug or file a new report if you continue to experience issues with current releases.

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