Revo HTPC
16Apr/103

Fixing Overscan & Underscan on Aspire Revo

I have had a few people email me about overscan and underscan problems when they hooked their Revo up to their television. I would first make sure you screen resolution is set correctly depending on if your television is 720p or 1080p. You can do this simply by right clicking on your desktop and hitting "Screen resolution". If this does not solve your problem then you might want to check your television settings. All televisions are different, but on my Samsung under Picture Options I see the Size setting. I have mine set to Screen Fit, but play around with it to see if this fixes your issues. Lastly we can do some manual over/underscan adjustments via the Nvidia control panel.

First go ahead and right click on your desktop and select "Nvidia Control Panel"

Next under "Display" in the tree control select "Adjust desktop size and position"

Then hit the "Resize Desktop" button which will launch and application. You will see two sliders on your screen which you can adjust to fix any over/under scan issues. The green arrows should be pointing at the corners of your television.

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  1. Note that while this is true under Windows, Linux users may have to resort to monkeying with xorg.conf to fix the issue, since most versions of the Nvidia Control Panel on Linux don’t have the overscan correction slider (and even in the versions where it appears, it may not always work). Choosing the correct setting for the HDTV is a better plan, but not all TV’s offer a “screen fit”, “pixel by pixel”, or “dot by dot” setting, and even those that do may require playing around with the timings of the signal sent to get the option to appear (example, the Sharp LC-42SB45U TV – if you have that particular model see http://michigantelephone.wordpress.com/2010/03/09/an-overscan-fix-for-the-sharp-lc-42sb45u-television-set-when-connected-to-a-computer-with-a-linux-operating-system-ubuntu-etc/ for instructions). But you should also bear in mind that when you use the overscan correction feature of the Nvidia Control Panel, what you are really doing is restricting the display area to a subset of the actual screen size as the computer sees it, meaning that you are losing sharpness (and possibly also increasing CPU or GDU usage, since the driver now has to downscale every frame!). If there is any way at all to use a 1:1 pixel mapping on your TV, that is the best way to do it – the picture will be a bit sharper and the system won’t have to work as hard.

  2. Agreed, strive to get your HDTV to display the correct resolution and don’t settle for adjustments on the HTPC. On my Samsung LN-S4695 screen it required a firmware update that I had to download off the net from somewhere other than Samsung’s official site. Application of this update was sketchy and some users reported bad flashes that required a mainboard replacement to fix. Mine was successful and now on the HDMI inputs I have an aspect option available of “Just Scan” that will show the proper resolution.

  3. I agree with you guys of course, which is why I said attempt everything but messing with the settings on the HTPC unless that is a last resort. I hope that came across :)


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