I'm the developer of software that interfaces with a HID USB device
(PowerLinc USB). A very small percentage (< 1%) of my customers are
having problems getting my software to commicate with this device.
Their system.log files are littered with lines like this:
Jan 8 17:33:08 localhost mach_kernel: USBF: 689.149 SmartHome
PowerLinc USB[0x26dc100]::GetFullConfigurationDescriptor - Error
(e00002ed) getting first 4 bytes of config descriptor
I understand from searching this list archive that error 0xe00002ed
means
the device is not responding at all. Until now, I've written off this
problem
as defective hardware and suggested to my customers that they get a
replacment
device (another company manufactures and sells the hardware). However,
I now
have a customer that has this device fail on one computer (15" iMac),
with this
exact error, but not another (12" Powerbook G4). Both machines are
running 10.3.2.
I've had the customer try the device in different USB ports and have
had them
unplug all USB devices except their keyboard & mouse. It always fails
on the
iMac but always works on the Powerbook.
Any idea why this is happeneing? I suspect the USB device is bad, but
in a
subtle enough manner that the Powerbook can stomach it for some reason.
Or
maybe the USB controller on the iMac is bad, but still able to work with
most other devices for some reason. Anyone have a guess or seen this
type
of failure before? Thanks in advance for the help.
Regards,
Matt Bendiksen
_______________________________________________
usb mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/usb
Do not post admin requests to the list. They will be ignored.
