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Old 08-30-04, 10:55 PM   #1
jcmdev0
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Default Line Shifting with DVI output on 6800

I'm getting interlacing effects on fullscreen video output using xine and vlc. I haven't tried any other players. It appears using xv output, but not with xshm output. Unfortunately xshm output is slow. It only appears when using dvi output and not when using vga output.

The full effect, when actually fullscreen/maximized, is that about every second line is shifted right. Dragging the window off to the right reduces the shifting, once the window is past the right side the amount of the shifting (40 or so pixels) it goes away.

I'm running at 1280x1024.

When rescaling the window the effects don't appear until a bit past 1230 wide. From 1230 to 1240 there are very few and then as width increases (height has to be proportional to get the actual video to that width) the number of offset lines increases (they are nearly evenly distributed but with a few gaps).

I'd take a screen shot but since xv renders directly to the output device it doesn't show up.

Debian 3.1
Kernel 2.6.8.1
EVga Geforce 6800 128MB
Tyan S2466 Dual AMD 2200MP
X4.3.0.1
Nvidia Driver 6111

Model: GeForce 6800
IRQ: 18
Video BIOS: 05.40.02.12.01
Card Type: AGP
Attached Files
File Type: txt XFree86.0.log.dvi.txt (31.0 KB, 157 views)
File Type: txt XF86Config-4.txt (2.9 KB, 168 views)

Last edited by jcmdev0; 08-30-04 at 11:36 PM.
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Old 09-24-04, 04:00 PM   #2
ToastyX
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Default Re: Line Shifting with DVI output on 6800

I have the same exact problem with my new eVGA GeForce 6800 GT and my Samsung SyncMaster 191T (19" LCD monitor).

This problem sounds very similar to these:

http://www.nvnews.net/vbulletin/showthread.php?t=6177
http://www.nvnews.net/vbulletin/showthread.php?t=16976
http://www.nvnews.net/vbulletin/showthread.php?t=25972
http://www.nvnews.net/vbulletin/showthread.php?t=27808
http://www.nvnews.net/vbulletin/showthread.php?t=25814
http://www.nvnews.net/vbulletin/showthread.php?t=15472
http://www.nvnews.net/vbulletin/showthread.php?t=12631

As you can see, this is not an isolated problem. Using 60 Hz helps in some instances but does not totally eliminate the problem for me, and changing the scaling does not make a difference in the native resolution, which is 1280x1024 on my monitor. The problem only affects the first Xvideo overlay and nothing else. The severity of the problem seems to depend on the resolution and refresh rate. This does not happen at all with my PNY GeForce4 Ti 4600 or my VisionTek GeForce3 Ti 500 with the same monitor, regardless of the resolution or refresh rate, so my guess is this problem only affects certain cards. This is not a configuration problem, so nothing I can do will eliminate the problem.

If anyone else has run into a similar problem, please post here.

Last edited by ToastyX; 09-27-04 at 03:00 PM.
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Old 09-25-04, 06:30 PM   #3
ToastyX
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Default Re: Line Shifting with DVI output on 6800

I figured out that the first Xvideo overlay uses the hardware overlay and subsequent Xvideo overlays use software overlays. The problem only seems to affect the hardware overlay, so if you open two programs that use Xvideo overlays, the second program will not exhibit the problem. I'm starting to wonder if the hardware overlay is buggy or defective on these cards.
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Old 10-10-04, 05:33 PM   #4
mstrobel
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Default Re: Line Shifting with DVI output on 6800

I'm having the same problem with a GeForce 6800 GT connected to a flat panel monitor running 1600x1200 at 60Hz via DVI. I'm using the 6111 drivers. Has anyone discovered an actual fix for this other than the workaround described above?
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Old 10-11-04, 06:30 AM   #5
ToastyX
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Default Re: Line Shifting with DVI output on 6800

What brand of GeForce 6800 GT do you have? I'm trying to figure out if this problem only affects certain brands of 6800-series cards. I'm in the process of getting a replacement, but I doubt that will make a difference.
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Old 10-11-04, 12:43 PM   #6
mstrobel
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Default Re: Line Shifting with DVI output on 6800

ELSA Gladiac 940GT, though I wouldn't think this would be a brand-specific problem.
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Old 10-14-04, 10:30 PM   #7
ToastyX
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Default Re: Line Shifting with DVI output on 6800

Well, ELSA's card looks like an exact replica of the reference design. So does eVGA's and Chaintech's. I wonder if other brands like XFX, Gainward, or Leadtek have this problem, especially the ones with dual DVI ports.

Anyway, I got the replacement today and it didn't make a difference as I expected. I haven't found a fix either.
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Old 10-17-04, 10:49 PM   #8
mstrobel
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Default Re: Line Shifting with DVI output on 6800

I'm given to wonder if this is a problem specific to the 6800-series cards, or if this is a more general drivers issue that other users are [still] experiencing. I've tried just about every solution I could come up with, to no end.
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Old 10-23-04, 09:06 AM   #9
dalurka
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Default Re: Line Shifting with DVI output on 6800

I'm experiencing the same problems with a gainward 5600 on a dvi samsung syncmaster 173x at 1280x1024.
I have noticed that if I change the refreshrate to 60hz then open an instance of xine then change the refreshrate back to 75hz and once again back to 60hz the distortions dissapear...

I do this with xrandr
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Old 11-02-04, 12:42 PM   #10
ToastyX
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Default Re: Line Shifting with DVI output on 6800

I'm surprised there's not more responses. Surely we can't be the only ones that have experienced this problem. I see threads dating back over a year affecting various cards and nothing has been done about the problem. I even found a thread where this problem is affecting a Windows user:

http://www.nvnews.net/vbulletin/showthread.php?t=29762

Is this a problem with certain TMDS transmitters or is the driver not handling them properly?

I found out that my PNY GeForce4 Ti 4600 and my VisionTek GeForce3 Ti 500 both have an external TMDS made by Silicon Image while the eVGA 6800 GT has an internal TMDS.

Do all 6800-series cards do this?
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Old 11-06-04, 03:33 PM   #11
mstrobel
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Default Re: Line Shifting with DVI output on 6800

Indeed, at this point I really doubt these are isolated incidents. On the upside, I just bought a Samsung 243T, and luckily 4:3 videos now play fine in fullscreen, though widescreen and letterbox videos still give me trouble. I'm not about to handicap my monitor by using a VGA connector over DVI, but this problem is really annoying. I don't have this problem at all in Windows, so it must be possible to correct it with a driver modification. I just wish nVidia would do something about it already. This is ironic considering that I just switched back from ATI because nVidia's Linux drivers are supposedly so much better.
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Old 11-07-04, 10:32 AM   #12
preilly
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Default Re: Line Shifting with DVI output on 6800

Just installed 6629 (on gentoo) - goofy line shift artifacts appear to be gone. That is with a BFG 6800GT OC.
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