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Powerstrip, 16:9, and XGA (Davis DLX650)

532 Views 5 Replies 2 Participants Last post by mflaster, Oct 19, 2001

mflaster

Discussion Starter · Oct 17, 2001

I was wondering if any of you with a non-4:3 screen (I have a 1.85:1 screen) and an XGA projector (I have a Davis DLX650) have used Powerstrip to get a native windows desktop of the right size.

I can use Powerstrip to get the right resolution, but unfortunately my projector gets confused by it, and thinks it's an 800x600 signal. If I start with a 1024x768 resolution, the projector synchs fine, and then if I change to 1024x554, it also synchs fine. The only problem is if I tell the pj to auto-calibrate - it then goes back to an 800x600 view.

I had posted this question to Ashley, and was told that my pj doesn't quite recognize the timings I was giving it - but he didn't have specifics on how to fix it.

Anyone have any suggestions/specifics? Maybe I'll post on the HTPC forum if no one here knows...

Thanks!

Mike

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Aaron Giles

· #2 · Oct 17, 2001

Mike,

I had the same problem at first, but then found the trick. First, delete any failed custom resolutions from PowerStrip. Then, with your screen set to 1024x768, go to the page where you create custom resolutions. Check the "Lock total geometry" box. Then enter the number of scanlines you want in the height box (576 is what you'll probably want for 16:9). Then uncheck the "Lock total geometry" box and hit the "Add new resolution" button.

This effectively sets you up with a screen of 1024x576, but the video signal is identical to the (working) 1024x768 signal. Only the blanking is affected.

I actually use these resolutons instead of YXY to get the ATI player to "zoom" non-anamorphic and 1.66:1 movies. I normally keep the desktop at 1024x576 for most stuff, but when I play a non-anamorphic movie, I switch it back to 1024x768. I also created a 1024x720 mode to play back 1.66:1 movies.

Hope this helps!

Aaron

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mflaster

Discussion Starter · #3 · Oct 17, 2001

Thanks for the reply. What you described sounds something like what I tried originally, but probably not quite the same.

When you look at your custom resolution, does it show *total* lines to be just a little more than 554, or just a little more than 768? I would think it would be the latter, but I noticed that my custom resolution has only about 580 total lines. I tried manually playing with it to make it 810, but that didn't work either.

Also, could you post the line from your pstrip.ini file in the powerstrip directory with the numbers for you custom resolution?

Thanks!

Mike

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Aaron Giles

· #4 · Oct 17, 2001

I'll try to grab the line from the .ini file tonight.

Aaron

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Aaron Giles

· #5 · Oct 18, 2001

As promised, here are the numbers for my screen:

1024x576=1024,32,136,152,576,99,6,125,65025,7

1024x720=1024,32,136,152,720,27,6,53,65025,7

Hope this helps!

Aaron

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mflaster

Discussion Starter · #6 · Oct 19, 2001

Thanks for the reply. I didn't try your exact timing, but I followed your methodology to get a 1024x554 signal which looked exactly like the 1024x768 signal. Unfortunately, I still see the same affect!

How do these monitors synch up, anyway? Do the "blanking" lines look any different then the signal lines? It almost seems like my projector is clever, and can tell that I'm not really using the 1024x768, and so goes into 800x600 mode...

Shouldn't my projector treat my 1024x554 signal (with extra front and back porch) exactly like a 1024x768 signal?

Mike

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