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I have a dual-boot Windows 7 64 bit/Linux 64 bit machine that uses ATI's Catalyst drivers. Sometimes I attach it to a 1080p LCD TV over HDMI. ATI is daft enough to provide a border to account for overscan.

I'm using an LCD TV. No overscan, or it looks like crap because the pixel mapping is not 1:1. How do I disable this driver "feature" in Windows? in Linux?

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3 Answers

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I'm not 100% sure what the problem is, but if you're connecting over HMDI, then you're probably going to have overscan issues as the TV cannot give its EDID over HDMI. You will have to manually compendate for overscan in the catalyst control center overscan section. I'm assuming you know about the overscan slider in the ATI CCC?

If your problem is that when you have that slider adjusted so that the boarder doesn't display and it still looks like garbage then I'm not sure what your problem is as pixels should still be 1:1 if you have the resolution set right. 1080p is 1920x1080.

Are you using the latest drivers if all of these are above are correct?

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I'm using the latest drivers. The problem is that the driver outputs 1920x1080 but draws the screen on a ~1700x900 rectangle inside that signal. There's a slider inside the Linux control center to control the amount of overscan adjustment but I haven't figured out how to get it to just never do that. It knows the brand of the TV so it's reading something from the HDMI cable. – joeforker Sep 23 at 0:55
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In Catalyst Control Center in wondows (I don't use it in Linux) you can go to the "Overscan" tab and slide it completely to the opposite side and it should eliminate overscan. It should be persistent in windows as I only had to set it once. – MarkM Sep 23 at 1:15
Where is this overscan slider? I can't find it anywhere and I'm kind of losing it when searching for anything in the CCC. – alex Oct 18 at 20:23
It's in the HDTV section. What version of CCC are you using? – MarkM Oct 18 at 23:09
I'm using 9.9 at the moment. The thing is it's not there for my TV, only for my LCD display. If I click configure for my TV, it sends me to the Welcome tab. This is not normal, right? – alex Oct 19 at 6:03
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ATI Catalyst Drivers 9.10 introduced a new feature:

Underscan/Overscan settings for TV can now be applied from the ATI Catalyst ControlCenter – TV Properties Adjustments page.

Maybe could be a solution for your problem.

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http://techhelpbot.com/content/how-change-options-ati-radeons-overscan-or-underscan

Exact instructions on how to disable ATI's Overscan....i'm not sure if it's just windows 7 x64 which has the dodgy GUI, but it's pretty horrible (I had same problem as you....couldn't change it because the option was hidden away).

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+1 This is the spot on answer - the option is hidden away on the small icon drop down menu at the bottom, not obvious if you don't know it's there. – Shevek Mar 17 at 16:34

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