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Radeon X1800XT Dual Display problem

Teasy

Teasy

Teasy

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Joined
23 Oct 2003
Posts
229
I recently decided to attatch my downstairs LG HTDV to my PC. I bought a 10 meter VGA cable and plugged everything in. Set the ATI display manager to extend my desktop to the TV and forced HDTV 720p resolution on the second display (I kept my monitor ar 1280x1024). Problem is the TV won't accept 1280x720 from the X1800XT. At first I just thought the cable was broken or the graphics card. But when I tried a lower resolution for the HDTV (1152x864) it worked. So I tried plugging the cable into my upstairs Samsung HDTV, and the same thing, every resolution under 720p works, but not 720p.. I really want to play HD video from my PC to TV, which surely would be best at its proper resolution. So does anyone know what's going wrong here?
 
Did you buy a VGA cable or a DVI/DVI to HDMI cable?

If its VGA, it odds on wont accept an HD signal from a non HDCP source.
 
Its a VGA cable, plugged into my graphics card using a DVI adapter. As I said every resolution below 1280x720 works fine, 1280x720 also works on my monitor with the same cable, so why not with the TV?

EDIT: Actually now that I look at it the resolution I'm using is higher then 1280x720 (I'm using 1152x864 and it works fine). But I'd prefer the correct resolution for the HD content I want to play.

As far as I know HDCP is some kind of HD encryption right?
 
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james.miller said:
what tv is it? and what content are you trying to play?
Click to expand...

I've tried it with a Samsung LE32R74BDX upstairs and a LG42LC55 downstairs. I just want to play HD movies from my PC HDD to the TV. I know I'll probably be able to do that anyway, I just wanted it to be displayed at the intended resolution rather then say, 1152x864, since that's going to be shrunk down one way and stretched the other..
 
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paradigm said:
Because through VGA it won't be a digital or HDCP signal, which the TV will want at that resolution. Try DVI and it should work fine.
Click to expand...

Ah right, so the TV's software just won't allow HD content at the proper HD resolutions unless they're encrypted the way it wants? (HDCP). Hmm, I might just have to see what it looks like playing these kind of movies at 1152x864 in that case. The VGA cable cost nearly £50 and I don't fancy spending another £50 on another cable.. Thanks for the advice though.
 
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ok. its almost always better to supply the panel with its native resolution whenever possible. with that in mind, try 1360x768 (1366x768 would be spot on, but missing 3 pixels form either side wont do any harm). the software scalers used in pc media players (especially if your using ffdshow) will do a better job at scaling your movies to the tv's native res. than the tv itself would.
 
james.miller said:
ok. its almost always better to supply the panel with its native resolution whenever possible. with that in mind, try 1360x768 (1366x768 would be spot on, but missing 3 pixels form either side wont do any harm). the software scalers used in pc media players (especially if your using ffdshow) will do a better job at scaling your movies to the tv's native res. than the tv itself would.
Click to expand...

Thanks that works, I didn't think of trying the maximum TV resolution. I've just got to try it with some HD video now but I'm sure it'll be fine since its almost exactly the same ratio as 1280x720 (unlike 1152x864).

Thanks again.
 
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glad i could help:)
 
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