Aspect ratio wrong in slideshow on HDTV

I have connected my PB to my HDTV with a DVI to HDMI cable. OS X recognizes the TV as an external display and supports it at 1920x1080@60Hz. Even recognizes it as Samsung device. Aspect ratio is correct, and everything works fine: desktop, Safari, iPhoto.
All great until I run the slideshow in iPhoto. Then resolution goes to 1600x1200@60Hz and the aspect ratio is wrong (stretched horizontally).
After returning from slideshow mode, the res goes back to 1920x1080 and aspect ratio is fine again.
Actually, the main reason I wanted to connect the PB to the TV was to view my photos in slideshow mode. So this makes me sad.
Changing the iPhoto Slideshow Format from Current Display to 4:3 or 16:9 doesn't solve the problem. Appears to make things worse actually.
Any ideas?
Hardware is PB G4 15" 1GHz with 1GB.
Thanks!

I would post that one on the PowerBook forum, but I suspect that you may have reached a limit of a 5 year old software that predates HD tv.
Regards
TD

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