After reading a notice on MacFixit today, I confirmed this new issue. After upgrading to Jaguar 10.2.1, when attempting to run an iPhoto slideshow using the Apple composite video cable (to display on a TV), the music stops, the slideshow changes to a lower resolution, and the slide transitions no longer work.
Im using a 14 iBook with 384MB RAM, with iPhoto 1.1.1. After starting iPhoto and selecting a group of photos to view, I clicked on the player button. It started immediately and worked normally, cross-fading nicely between photos, playing the selected music in the background. While the slideshow was running, I plugged in Apples composite video connector, which worked perfectly in 10.1.5, and the music immediately stopped, the resolution on the slide show dropped below the set 1024x768, and it began very jerkily displaying the photos. This feature is now essentially unusable. When I stopped the slideshow by clicking on the touch pad, removed the composite video cable, and restarted the slideshow, everything was again fine. When I plugged in the cable, and started the slideshow, I got either a blank white screen with no music, or the previously described jerky, low res photos.
A partial workaround was posted on MacFixit today. If you plug in the composite cable BEFORE starting up iPhoto, the slideshow will play (without the white screen or much reduced resolution), but still NO music background. I also noted that the transitions, although more normal with this workaround, were also slower. This slow transition was why I switched my iBook to thousands of colors, since my Rage Pro video couldn't handle the transition smoothly in millions of colors. Those with the newer Radeon Mobility chip may not notice this difference.
That's news to me. My 14" iBook was purchased with the composite cable this past April. A 256K L2 cache was standard...no option to select a 512K L2 cache. The composite cable worked just fine with MacOS 10.1.5. Why sell a cable when it's known it won't work with your current offerings? Did Apple intentionally make changes in the OS to downgrade the capability of its recent products? Sounds odd to me.
Using the Apple A/V Cable, I get no problems. My iBook won't support the composite video cable since I only have a 256K L2 cache. The Apple store says the iBook has to have a 512K L2 cache for the composite video cable to work properly.
Does the selected background music play when you're playing your iPhoto selections to the TV via the composite cable? I've found the proposed workaround for my 600Mhz 14" iBook with 384MB RAM of plugging in the composite cable BEFORE starting the iPhoto app DOES permit me to now display the photos on the TV using the composite cable, but the background music stops, and the transitions are slower. With your Radeon Mobility graphics processor, you probably wouldn't notice a transitions slowdown, as I do with my Rage Pro chip.