mic is not working.

i am not able to use mic , cam, bluetooth in Ubuntu 10.04, but in windows 7 all features are ok, t
please help me to solve issue,

i am using dell ispiron 15R laptop.
my system details
hashir@hashir-laptop:~$ lsusb
Bus 002 Device 008: ID 413c:8162 Dell Computer Corp.
Bus 002 Device 007: ID 413c:8161 Dell Computer Corp.
Bus 002 Device 006: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 002 Device 002: ID 8087:0020
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 0c45:6461 Microdia
Bus 001 Device 003: ID 0461:4d22 Primax Electronics, Ltd
Bus 001 Device 002: ID 8087:0020
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub