HDMI scanning / scaling issues with AMD graphics

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caboosemoose

Gawd
Joined
Aug 26, 2002
Messages
584
OK, I am at my wit's end. I've been trying to run various displays in recent months via HDMI and AMD graphics cards and always hit scaling / scanning issues.

It's related to AMD cards treating any HDMI display as an HDTV and overscanning the thing.

Do a search on google and the solution seems simple: tweak the slider in the "Scaling Options" section in CCC.

Pushing the slider to 0% over or underscan does get rid of the black borders, but the image is still not pixel for pixel. It's slightly corrupted - essentially, it's taking the panel's native res (1080p) converting it to something slightly smaller and then stretching that over the 1080p pixle grid. It's only slightly off, but in this context, slightly off = totally fucking broken.

Does anyone have an idea how to fix this incredibly stupid fucking problem.

Please help me before I self harm!
 
I have a Samsung 2494HS running on an ATI card, I've used both hdmi2hdmi and dvi2hdmi. And both result in incorrect pixel mapping, basically he picture is squished, this happens because ATI, and some nvidia, cards "overscan" the image to compensate for older LCD HDTVs cropping to image.

My solution to fix this was:
1) disable overscan in CCC
2) set my monitor To 1:1 pixel mapping. Called "just scan"?
Sony call it "full pixel"
This is under setup->image size->just scan
3) set "A/V mode" to off.
This is under setup(page2)->av mode

Step 3 is unique to Samsung monitors as far as I can see. Don't quote me on it though.

Here is an article AnandTech did on the Samsung 2493HM, which is one model before mine, which explains quite nicely what "just scan" and "av mode" do.

Also the articles that Mozex mentioned above helped a lot.

http://www.anandtech.com/show/2518/11
http://www.anandtech.com/Gallery/Album/105#12
http://www.anandtech.com/Gallery/Album/105#14
 
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