New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

iMac - USB device Won't work verunless it's plugged into the first USB port


Post Reply New Thread Subscribe

 
Thread Tools
ErikJenkins1187

 
Member Since: Aug 21, 2008
Location: Maryland
Posts: 233
ErikJenkins1187 will become famous soon enough
Mac Specs: 2.66Ghz Penryn C2D iMac

ErikJenkins1187 is offline
Has anyone had problems getting USB devices to work unless it's plugged into the very first USB port on the back of the iMac 20" 2008 edition? I had purchased a new plug in for my Line 6 recording interface that allowed you to use POD Farm as an AU plug-in, in other words you could record the guitar/bass/vocals raw and manipulate the sound afterwards, where as before you had to choose a tone BEFORE you pressed record and you were stuck with it. For some reason, every time I tried to select it as an audio unit plug-in, it would tell me I had no Line 6 gear or iLok plugged in. After spending $50 on this, I called line 6's support line.

The tech there told me that Apple's USB bus structure was a little funky and they're (Line 6's) products always needed to be on the first USB port or it was no dice for AU plug-ins, same if you had the iLok (a dongle for using the software without the hardware). He told me that Apple's other USB ports were partially crippled. This is all news to me, but low and behold his suggestion fixed my issue. He explained the laptops are the same way, he said Mac Pros have no issues though. Why would Apple intentionally do this to the iMac/Macbook/MBP USB bus? Has anyone else had this issue?
QUOTE Thanks
hughvane

 
hughvane's Avatar
 
Member Since: May 18, 2008
Location: Banks Peninsula, New Zealand
Posts: 3,261
hughvane is just really nicehughvane is just really nicehughvane is just really nicehughvane is just really nicehughvane is just really nice
Mac Specs: MacMini 2.4, 4 Gb, OS 10.8 and 10.6; MacBook 2.4, 2 Gb, OS 10.5.8; G4 eMac 1.25, 2 Gb, OS 10.4.11

hughvane is offline
Mac USB power is not the best, generally regardless of model, but especially so with laptops, and I think the simplest solution will be to use a powered external USB2 hub. That should allow you to use any port on your iMac with any USB device. Some hubs have a port or two with 1000mA each. What is the power demand of your external device?

Re Port 1 power, it may be that the bus sends a higher voltage to that port, but that's only my guess.
QUOTE Thanks
ErikJenkins1187

 
Member Since: Aug 21, 2008
Location: Maryland
Posts: 233
ErikJenkins1187 will become famous soon enough
Mac Specs: 2.66Ghz Penryn C2D iMac

ErikJenkins1187 is offline
For security reasons, Line 6 hardware only works when directly attached to the bus. So thats a no go on using a hub, I couldn't get it to work at all when I had it hooked to my USB/Firewire Combo hub. The midi keyboard and preamps work just fine when I have it hooked to the other USB ports on the back of the iMac, but using it's software as an AU plug-in in Garageband/Logic is broken due to Apple's USB bus limitations not allowing software to see the keyboard serial number. It's definitely an Apple issue, I can use this interface on my Lenovo T400 laptop no problemo, any USB port will work. I might bootcamp my iMac again as an experiment to see if this problem persists in Windows XP.

It's funny, the support tech I talked to there had a MBP and had the same issues, he said they have tried recoding the firmware in they're devices 10 ways to Sunday and still can't get to work on other USB ports. I have read users of M-Audio USB interfaces can have the issues as well. I am glad I also have a MOTU 828 thats FW400 and also self powered, that bad boy sounds way better anyways!
QUOTE Thanks
hughvane

 
hughvane's Avatar
 
Member Since: May 18, 2008
Location: Banks Peninsula, New Zealand
Posts: 3,261
hughvane is just really nicehughvane is just really nicehughvane is just really nicehughvane is just really nicehughvane is just really nice
Mac Specs: MacMini 2.4, 4 Gb, OS 10.8 and 10.6; MacBook 2.4, 2 Gb, OS 10.5.8; G4 eMac 1.25, 2 Gb, OS 10.4.11

hughvane is offline
I remember reading in other forums about using a USB 'splitter' (my terminology) in order to harness the power from two USB hubs for an external device that has high demand.

I'm puzzled, in fact intrigued, to read that the use of a powered hub prevents use of your external device. To the best of my knowledge, using a hub doesn't significantly change anything in terms of interconnectivity. We learn something new every day .

Yes, USB power on Macs is an old and recurrent issue, which is why some people stay with a Windows machine in addition to their Macs. I don't think the use of Win XP via Bootcamp will change the USB power issue, as it's hardware - not software - related.

I'm going to suggest that you post your USB power issue on The macosxhints Forums - For discussing everything OS X... where there are some seriously knowledgeable people who may be able better to explain WHY the USB port 1 works where others don't, and to suggest a fix or a workaround.
QUOTE Thanks

Post Reply New Thread Subscribe


« Degree of Difficulty | iMac G4 RAM »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
4 Port 2.0 USB Mini Hub Question munkism Other Hardware and Peripherals 4 03-18-2010 06:15 PM
Imac USB port JaneChua OS X - Operating System 0 01-10-2007 10:52 AM
USB Audio device probs mig.gentry Apple Notebooks 6 11-08-2004 09:05 PM
USB port won't work bruubaker Apple Desktops 1 01-20-2004 04:29 PM
Can't boot OS10.2 on an external USB device Martin Apple Notebooks 1 12-16-2003 06:51 AM

All times are GMT -4. The time now is 09:22 AM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?