wireless issues ubuntu 12.04

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http://askubuntu.com – My ubuntu 12.04 lts does not detect any wireless network unless i reboot with the ethernet connection. With the ethernet connection, both the wifi and ethernet are detected and at that point in time, even if i remove the cable, the system keeps on running with the wifi. However, each time , i am having to boot my laptop with the cable to be able to go on the net . Another problem is that i cannot save a brightness setting on the ubuntu 12.04. Any body help please. thanks sharat@sharat-Satellite-L645:~$ lshw WARNING: you should run this program as super-user. sharat-satellite-l645 (HowTos)