Can confirm this bug on three different boxes. Ekiga doesn't work on
Karmic using pulse. This essentially leaves Ubuntu without a SIP-capable
phone application. Empathy doesn't count as it's SIP support is close to
non-existent (can't connect to sipgate for example, fails to place calls
repeatedly)
Seems indeed related to the Logitech QuickCam. I own one and experience
the same bug.
2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux
Propreitary nvidia kernel module loaded.
The following error message block is repeated ad infinitum
Jan 19 16:40:49 robert-desktop