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Windows 7: lifecam is not detected while ipod is connected to my computer.


11 Jun 2012   #1

Windows 7 Ultimate Service Pack 1
 
 
lifecam is not detected while ipod is connected to my computer.

lifecam is not detected while ipod is connected to my computer.

If I disconnect the Ipod... all fine.

Why ??


My System SpecsSystem Spec
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11 Jun 2012   #2

Windows 7 Pro x64 / Pro x86 (Netbook)
 
 

Maybe your USB hub does not offer enough power output (even if you do not appear to use a hub, there are internal USB hubs integrated into the mainboard). Try using another port for one of the devices. As far as I know, both an iPod and most webcams request 500mA of current from their respective USB ports, which is also the maximum total current output for most USB hubs.
My System SpecsSystem Spec
11 Jun 2012   #3

Windows 7 Ultimate Service Pack 1
 
 

Extra data: The lifecam is connected to the back USB port while the ipod is connected to the front USB port.
My System SpecsSystem Spec
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11 Jun 2012   #4

Windows 7 Pro x64 / Pro x86 (Netbook)
 
 

If one is on the front port and one on the back, I would expect them to run on separate power supplies. Just to make sure though ( because it is the only reason I can imagine right now), could you check the energy consumption listed in your USB hub devices?
You can check this in your Device Manager, in the properties of your installed USB hosts.
I made a PSR recording, so you can follow its step-by-step-instructions in case you don't find it straight away. Sorry for the German language, I could not find the language settings for PSR.


Attached Files
File Type: zip Problem_20120611_2009.zip (695.7 KB, 10 views)
My System SpecsSystem Spec
11 Jun 2012   #5

Windows 7 Ultimate Service Pack 1
 
 

Bingo !!!

When both the WebCam and the Ipod are connected all 500 mA is taken by the WebCam and the Ipod gets None. (See Attach Files).

When only the Webcam is connected all 500 mA is taken by the Webcam. (See Attach Files).

That explain the issue.

But ... is it normal ?


Attached Thumbnails
lifecam is not detected while ipod is connected to my computer.-before.png   lifecam is not detected while ipod is connected to my computer.-after.png  
My System SpecsSystem Spec
11 Jun 2012   #6

Windows 7 Pro x64 / Pro x86 (Netbook)
 
 

Quote   Quote: Originally Posted by BoazBoaz View Post
But ... is it normal ?
Unfortunately, yes, or at least common. In my (admittedly limited) experience, I have not yet seen a mainboard without that limitation (although I am certain it can be done). Right now I can think of two possible solutions:
  1. Get a USB hub with its own power supply. They usually can provide 500mA on each port, because the energy is provided by a power adapter, directly from the power line.
  2. I see five USB root hubs in your device manager. You could try other USB ports to see if one of them belongs to one of the other four root hubs. If you can get a clear assignment worked out, you could mark the ports according to their hubs (maybe with coloured CD pens, that's what I used). It's not very elegant, but this way you will at least be able to immediately tell if one of the root hubs might be reaching its limits.
My System SpecsSystem Spec
11 Jun 2012   #7

Windows 7 Ultimate Service Pack 1
 
 

Thank you very much.
Well done.

I moved the lifecam to other slot and now both the lifecam and the ipod get 500mA.


Attached Images
 
My System SpecsSystem Spec
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 lifecam is not detected while ipod is connected to my computer.




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