Comment 19 for bug 459445

My guess is that all these troubles are related to the kernel module snd-usb-audio.

Got the same Webcam here E3500 with built in microphone. With snd-usb-audio loaded I am unable to suspend/resume (kernel-suspend) in Lucid-amd64.

Module snd-usb-audio has no suspend/resume script!

My solution is to blacklist the module (micro) in /etc/modprobe.d/blacklist-xyz.conf and rebuild initramfs. Now suspend and resume works smoothly.