Comment 35 for bug 515109

The has also been backported to Karmic, probably through kernel updates.
Suspending to ram and disk used to work for me on Karmic, but now there is the same 'error 16' message.

Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 064e:a129 Suyin Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 413c:02b0 Dell Computer Corp.
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

hub 1-0:1.0: suspend error -16
pm_op(): usb_dev_suspend+0x0/0x10 returns -16
PM: Device usb1 failed to suspend: error -16
PM: Some devices failed to suspend

Note: Bug #522998 is not the duplicate of this one. #522998 deals with USB3 ports, whereas this one is apparently caused by built in laptop webcams.