Jerky picture after upgrade to Samsung 40" (1 Viewer)

[mogi_dk]

What about wait for vertical retrace ?

If this has nothing to do with this issue just ignore my post.

I think I have my MP set up for using DirectX at fullscreen and change my graphics card output setting to always for vertical retrace - well at least for MP.

I use a standard 19" LCD monitor - but I do not have any tearing. Is it tearing you are experiencing ?

 

[mogi_dk]

Sorry I didn't read your post thoroughly enough. I can see that you are forcing it to wait for vsync and you are using DX fullscreen mode.

 

[mogi_dk]

After done a bit more thinking - I think that you still have a vsync problem...

Can you see any difference when comparing the force vsync option with enabled and disabled ?

 

[SweMart]

Can you see any difference when comparing the force vsync option with enabled and disabled ?

Yes, it get's a little better after forcing it. But footy still is unwatchable.

 

[SweMart]

Problem solved .... kind of

I switched from VGA to DVI->HDMI, this lets me chose 50Hz - only problem that is still left is that the TV seem to overscan. I loose approx 1cm at every border when using HDMI. Samsung states that the HDMI/DVI connection isn't for PC usage.

I guess I could use Powerstrip to tweak this but at least I'm semi prepared for the World Cup.

Thanks for all of the input.

 

[jcee]

some similar experience here:

Used to have MP with FX5200 hooked-up to CRT TV via composite..
Had tearing but got rid of it by selecting exclusive DX mode.

Switched to Pioneer Plasma via DVI => HDMI.
Got tearing again.. Checked the exclusive DX checkmark. It was selected..
Also went to the display driver.. Set VSYNC=ON..

Not really better.

I use the NGO optimized Nvidia drivers. There I selected "treat as HDTV", "720p" and went into the overscan compensation dialog.
There I was able to tweak it in a way so that everything is on screen (taskbar,icons tec.) The strange resolution it then came up with is something like 1244x649..
But no problem, it exactly is on my screen.. So its fine..

But no idea what to do to prevent tearing.

Is it a matter of screen refresh rate? What should I select? My plasma works with 60Hz,75Hz,100Hz.. but see no difference.

Did not tried 50Hz yet. ! Do you thing it would help?
I was wondering how it works?! The display itself is running at 75Hz (or 100Hz, selectable).. But what is send over the HDMI cable?!

 

[ziphnor]

I switched from VGA to DVI->HDMI, this lets me chose 50Hz - only problem that is still left is that the TV seem to overscan. I loose approx 1cm at every border when using HDMI. Samsung states that the HDMI/DVI connection isn't for PC usage.

There is intentional overscan on many TV's, both LCD, CRT and plasma. The overscan can be obtained in two ways:

One is to have a physical overscan, ie you hide some pixels on the edges of the display. In this case you *will* get overscan running 1:1 pixelmapping with the TVs native resolution, and you should use powerstrip or nvidias utility to design a resolution -in-resolution if you want to avoid the overscan(no need to avoid overscan if MP is the sole use of HTPC).

The second is overscan by zooming. That is, upon recieving a signal the TV will scale it larger than its physical resolution and then crop it. In this case overscan is a bad thing, because you feed the TV a signal in its native resolution, and it then proceeds to scale it up causing scaling artifacts.

If you want to ensure you are getting 1:1 pixelmapping(more important than overscan IMHO) try out this test:
http://archive.avsforum.com/avs-vb/showthread.php?s=&threadid=90884
(you need to rotate it 90 degrees to test for vertical scaling artifacts).

As to the mention that the HDMI/DVI isnt for PC's, that can mean alot of things. On my HDTV, all inputs except VGA are treated with some kind of sharpening filter(even though sharpness is set to 0), which has a nasty effect on the desktop, but looks fine in movies and the MP interface.

 

[ctgoodman]

If you are using the nvidia drivers is there not an option for adjusting the overscan? I think its under size and position for the display in the nvidia controls. I have to stretch out my svideo output to my tv so it fills the screen, I think you can shrink it as well.

 

[knutinh]

It seems that its a wild west out there in flat screen land. Some of the common "features":

1:1 pixel resolution is impossible. Philips (among others) are outputing expensive 1920x1080 pixel lcds that does not accept 1080p for input! Others enforce rescaling + cropping meaning that one source pixel is distributed on perhaps 1.1 display pixels, and borders around the picture is lost

Panels are "rate locked" at 60 Hz (NTSC standard) so even if it does accept "PAL" 50 Hz at its inputs, it will be rate-converted.

DVI/HDMI/VGA/s-video inputs are treated differently, and theres no guess which will fit your setup, as info from producers is scarce to say the least.

Plasma screens have problems with burn-in for static images suc has the MP GUI.

Plasmas may be "hd-ready" but still have a weird resolution such as 1024x1024 or 1024x768 on a 16:9 display, meaning that the image must be stretched to fit.
The sad thing is that most customers know nothing of these problems, and the lcds on display in shops is near impossible to test for these things.

Hopefully, the market will mature once we get past this "must have flat screen for football " thing

-k

 

[zombiepig]

swemart - from what i've read the overscan when using hdmi on samsung lcds is unaviodable, but it was a while ago i read that and maybe there's a workaround now. i'd suggest posting a topic over at avsforum (http://www.avsforum.com/avs-vb/forumdisplay.php?f=26), as those guys are definetly the experts with connecting pcs->tvs!