Hi,

> 1. I suspend the PC by closing the lid while Wifi is alive.
> 2. I move across physical locations to a diffferent Wifi network and
> power up the machine from suspend state.
> 3. NM showing trying Wifi to the configured SSID but fails.

[snip]

> Actions tried:
> 1. Restart networking and NM - same problem.

Try, stopping networking services (ensure that the
wifi interface is brought down) and do modprobe -r on
the wifi driver module and reload them (using modprobe).
This technique worked on my Slackware running on ASUS
1201T for a similar problem.

Haven't tried on Ubuntu though. On Slackware, I do not
use NetworkManager. I'm using good old iwconfig tool
(created my own custom network service management
script using this) and it works pretty well for me.

Cheers,
Chandrashekar.

-- 
http://www.slashprog.com/
http://www.chandrashekar.info/
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