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I've connected a HDTV with HDMI on my Radeon 4670, using the open source ati driver. However there is "overscan" which cuts off a bit of each edge of the screen, about the size of the gnome-panel. How can I fix this so it displays the full resolution?

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8 Answers 8

up vote 6 down vote accepted

The issue was with the TV, not Ubuntu. For this Samsung TV I had to choose Menu / Picture / Picture Options / Size / Screen Fit (instead of 16:9).

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For the Sharp Aquos, it's under Menu > System Options > View Option > View Mode > Dot by Dot –  Pakman Aug 30 '12 at 4:29

I'd suggest checking your graphics card driver software, I know ATI comes with overscan options. In windows there was a program called power strip that I used to fix this on mine with Windows 7.

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There is no overscan option in Cataylst for linux and command line arguments for aticonfig does not work. Fixing xorg.conf does not help either. –  user71023 Jun 16 '12 at 15:06
    
Ah, but they do work! After activating the FGLRX driver in Ubuntu 12.04, open the Catalyst Control Center (Administrative) and go to Display Manager > Digital Monitor (1) > Adjustments and drag the scaling option slider from 15% underscan to 0% overscan. –  Pakman Aug 30 '12 at 4:22
    
Note: this answer is technically for the restricted AMD driver, not the open source radeon driver like the question asked –  Pakman Aug 30 '12 at 4:28
    
I used to use powerstrip. it is a very useful tool that lets you adjust timings on practically any card on the market. In other words its really well tailored to fix just this issue. –  Octopus Mar 10 at 6:43

Both right,

New t.v.s are set to allow overscan, so the driver will often do that very overscan that is available when set to a desktop resolution.

So, the dirvier for the video card - might - have an overscan setting to resolve this if lucky, or as Hew found out you might be able to set the t.v. to display the incoming signal without over scan.

Try the video display driver first, then if no luck, try your t.v. settings. It is best to correct in the driver setting first, instead of setting a fixed display.

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As the above comments are saying, the problem is most likely due to the TV and not the driver.

However, if you have a Sharp Aquos TV, "Dot by Dot" mode might not be available in the menu as Pakman mentioned; I couldn't find an option for enabling "Dot by Dot" mode anywhere.

Instead, I solved the problem by discovering that my remote has a dedicated "Wide Mode" button for this setting, which looks kind of like this: |<>|. Press it to toggle from Stretch to Dot by Dot mode.

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In my case, activating overscan on the monitor (a Philips 244E) didn't fully solve the problem (the monitor's space was not fully covered). I had to deactivate overscan on the monitor and do it using the AMD catalyst control center (gksudo amdcccle).

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I using ubuntu 13.10 and had the same overscan problem using a 32" dynex led tv. Im using a shuttle computer with 3rd gen intel graphics 2500 connected buy hdmi cable. I went into my advanced video settings on my tv and turned off overscan (problem fixed)

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I Have struggled with this problem for longer than I care to say! This may help if you have a NVidia graphics card, and Ubuntu 14.04. Go to the Ubuntu software center, search for NVidia drivers and download "Nvidia X Server Settings". Once downloaded, click on the Nvidia icon, and select x server display configuration. Once there, simply slide the underscan slider until the desired size is achieved.

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As someone before me wrote: This isn't a software problem. Many TV models behaves differently if the HDMI port input label is set to "PC" or something else.

Make sure that your TV knows what's connected to the other end of your HDMI cable

On my 47" LG LCD I can set it at Menu->Option->Input Label

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