1. The workaround before doesn't work. Sorry, my mistake with an
intermittent bug.

2. Bug is still present in Jaunty with 2.6.28 kernel.

2. I have finally found out how to turn this bug on and off.

* plug in webcam.
* use gnome-sound-recorder to record something. Play it back. For me, it is at 
the wrong speed.
* now, to make the bug go away, access the webcam video with (for example) 
"gst-launch-0.10 v4l2src ! xvimagesink"
* record something again. Now it should be recorded at the right speed.

Relevant sections of /var/log/kern.log, after plugging in the webcam:

Apr 18 11:59:59 dave-laptop kernel: [11814.892121] usb 2-1: new full speed USB 
device using uhci_hcd and address 8
Apr 18 11:59:59 dave-laptop kernel: [11815.083684] usb 2-1: configuration #1 
chosen from 1 choice
Apr 18 11:59:59 dave-laptop kernel: [11815.087217] gspca: probing 041e:4068
Apr 18 11:59:59 dave-laptop kernel: [11815.277174] ov519: I2C synced in 1 
attempt(s)
Apr 18 11:59:59 dave-laptop kernel: [11815.277180] ov519: starting OV7xx0 
configuration
Apr 18 11:59:59 dave-laptop kernel: [11815.289180] ov519: Sensor is an OV7670
Apr 18 12:00:01 dave-laptop kernel: [11817.259043] gspca: probe ok
Apr 18 12:00:01 dave-laptop kernel: [11817.259095] gspca: probing 041e:4068

I don't understand this, but it always works.

-- 
sound records at wrong speed with USB webcam
https://bugs.launchpad.net/bugs/264864
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