I am having the exact same problem on my Dell600m. When I upgraded to the new kernel 3.2.0-29, the signal strength applet shows zero (completely dimmed out) when it usually shows 3 out of 4 lines bright on my home network. Booting to the previous kernel 3.2.0-27 fixes the problem.
I am having the exact same problem on my Dell600m. When I upgraded to the new kernel 3.2.0-29, the signal strength applet shows zero (completely dimmed out) when it usually shows 3 out of 4 lines bright on my home network. Booting to the previous kernel 3.2.0-27 fixes the problem.