[G4] USB 2 Communications Problem

[Eric Wood]

Am Jan 8, 2008 um 9:44 AM schrieb Thomas Brooks:

>
>
> Brand new iMage Webcam installed 1/4/08 on 1.2 GHz PowerPC G4 with  
> 1.75 GB Ram.
>
> Frame rate about 3 per minute, pictures but not video more like a  
> series of camera shots. Have high speed cable modem with Comcast.  
> Have separate USB 2.0 PCI card installed
>
> Tried running Running iMage Tester their own software and all  
> checks OK. Same thing happens with Yahoo Messenger and iChat.
>
> Also loaded maccam driver and got error message <USB 2  
> Communications Problem>.
>
> In all software my USB 2 is recognized and I can also run Plextor  
> PX-708UF2 external DVD and Firewire/USB 2 250GB external Hard Drive.
>
> I have disconnected everything on USB except Macally ICEKey  
> Keyboard, Orbit Optical TrackBall and Bluetooth all of which are on  
> a different USB 1  card.
>
> On occasion if I try to hot plug the camera it cannot be recognized  
> unless I restart the G4.
>
> The iMage support, of course, thinks it is my problem and has  
> offered no help other than to check firmware( I have latest) and  
> suggest I disconnect USB peripherals.
>
>
> Any suggestions on how to look for other hardware conflicts or how  
> to trouble shoot the USB 2 card and connections? Everything shows  
> correctly on About This Mac.
>
> Thanks!
>
> Tom Brooks
>
That bit about it not being detected if hotplugged is sure odd. Don't  
know if that indicates a hardware incompatibility.

I wonder if it's only operating at a lower speed than USB 2. I saw  
the USB busses looking rather mixed up, with two total high speed  
mixed with regular. Why did it list them in such an order, and not  
together? I'd say make sure only high-speed devices are on the USB 2  
card if you haven't done that and then see what happens. If nothing  
else, maybe try a different card. I have a similar configuration to  
yours, a Power Mac G4 with a USB 2 card, and I'm pretty sure speed is  
decent, though I can only test it with a digital camera and a flash  
drive, and I have no idea based on that whether it's operating at  
full speed. Seems fast though.

Eric