Read register failed

[aL3xa]

Hi all,

for a while I've been suffering from an annoying bug... I cannot dig
what's causing this problem, but at some point my webcam stops working
and I get hundred of these kind of messages in dmesg:

[55419.872940] sn9c20x: Read register failed 0x1005
[55419.874072] sn9c20x: Read register failed 0x1005
[55419.874333] sn9c20x: Read register failed 0x1005
[55419.874820] sn9c20x: Read register failed 0x1005
[55419.875322] sn9c20x: Read register failed 0x1005
[55419.875821] sn9c20x: Read register failed 0x1005
[55419.876326] sn9c20x: Read register failed 0x1005
[55419.876825] sn9c20x: Read register failed 0x1005
[55419.877327] sn9c20x: Read register failed 0x1005
[55419.877828] sn9c20x: Read register failed 0x1005
[55419.878205] sn9c20x: Read register failed 0x1005
[55419.878707] sn9c20x: Read register failed 0x1005
[55420.376206] sn9c20x: Read register failed 0x1005
[55420.376444] sn9c20x: Read register failed 0x1005

And sometimes, on shutdown these lines appear repeatedly and my
usplash is a bit messed-up... But, I've noticed one thing: if I run
Cheese, I get this in dmesg:

[55425.417113] sn9c20x: Write register failed index = 0x10FB
[55425.417610] sn9c20x: Read register failed 0x1005
[55425.419365] sn9c20x: Using yuv420 output format

And after that, my webcam works again...
Should I run Cheese in background to get my webcam working all the
time?! =D
I've noticed that this is a common bug... but, if you do, how do you
solved it?!

[Josua Grawitter]

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This problem can only come directly from the usb subsystem. Do you use a very
long cable or a lot of usb-devices on one port?

GWater

[aL3xa]

Well, I don't find my webcam cable too long, but I have pretty old
machine with no generic USB 2.0 support, so I use PCI USB card... It
may have something to do with that... And I've freed as much USB
connections I could, but I still get the same error... I'll try to
change USB card... don't think it'll help, but... hey... At least I'm
going to change something...
=D

> This problem can only come directly from the usb subsystem. Do you use a very
> long cable or a lot of usb-devices on one port?
>
> GWater
>

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