Same situation with me. Philips webcam worked fine under 9.04. After upgrade to 9.10 "could not detect video device ...".
lsusb appears to detect the device:
Bus 001 Device 004: ID 04a9:1729 Canon, Inc. MX700 ser
Bus 001 Device 003: ID 0471:2034 Philips
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 07cc:0200 Carry Computer Eng., Co., Ltd 6-in-1 Card Reader
Bus 002 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Same situation with me. Philips webcam worked fine under 9.04. After upgrade to 9.10 "could not detect video device ...".
lsusb appears to detect the device:
Bus 001 Device 004: ID 04a9:1729 Canon, Inc. MX700 ser
Bus 001 Device 003: ID 0471:2034 Philips
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 07cc:0200 Carry Computer Eng., Co., Ltd 6-in-1 Card Reader
Bus 002 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub