My Microdia (SN9C201) webcam doesn't work properly in Linux anymore

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My Microdia (SN9C201) webcam was working in Linux, but it has been
failing lately.  Take a look at the attached snapshot to see what I
mean.  It's like that all the time in Linux these days, but it works
perfectly in Windows.

I've tried using different USB ports and even a different computer
without success.  Does anyone know what's going on here and how we can
prevent this problem?  Let me know if you want me to send any
additional information.


`--> lsusb | grep Cam
Bus 001 Device 006: ID 0c45:627b Microdia PC Camera (SN9C201 + OV7660)


`--> lsmod | grep sn9c
gspca_sn9c20x          27437  1
gspca_main             21628  2 gspca_sn9c20x
usbcore               146241  11
ehci_hcd,uhci_hcd,usbhid,snd_usbmidi_lib,snd_usb_audio,uas,gspca_main,usb_storage,gspca_sn9c20x,ums_cypress


`--> uname -a
Linux <Host> 3.2.8-1-ARCH #1 SMP PREEMPT Mon Feb 27 21:51:46 CET 2012
x86_64 Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz GenuineIntel
GNU/Linux


`--> tail /var/log/kernel.log
...
Mar  3 09:54:10 <Host> kernel: [ 4122.732350] gspca_sn9c20x: Set 640x480
Mar  3 09:56:28 <Host> kernel: [ 4260.776109] gspca_sn9c20x: Set 640x480
Mar  3 09:56:29 <Host> kernel: [ 4261.408847] gspca_main: ISOC data
error: [0] len=0, status=-18
Mar  3 09:56:29 <Host> kernel: [ 4261.408853] gspca_main: ISOC data
error: [1] len=0, status=-18
Mar  3 10:21:41 <Host> kernel: [ 5773.917404] gspca_sn9c20x: Set 640x480


`--> tail /var/log/errors.log
Mar  3 10:48:00 <Host> motion: [1] Retrying until successful
connection with camera
Mar  3 10:48:03 <Host> motion: [1] v4l2_next: VIDIOC_DQBUF: EIO
(s->pframe 0): Input/output error
Mar  3 10:48:03 <Host> motion: [1] v4l2_next: VIDIOC_QBUF: Invalid argument
Mar  3 10:48:03 <Host> motion: [1] Video device fatal error - Closing
video device
Mar  3 10:48:10 <Host> motion: [1] Retrying until successful
connection with camera
...

Attachment: 2012-03-02-205300.jpg
Description: JPEG image


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