[G4] USB 2 Communications Problem

[Thomas Brooks]

Eric:

Thanks! You are exactly right. I could not even tell which busses were  
high-speed and which USB 1.0 without putting the device on each one of  
them. Profiler   shows  2 high speed USB busses. Each represents a  
different PCI card but the camera will only work on one of them.

Thanks anyway.

TB

###
On Jan 8, 2008, at 3:23 PM, Eric Wood wrote:

> 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
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