Maybe the necessity to disable and re-enable NM in order to reactivate
wireless connections once the devices have been unblocked is a bug of
its own.

Here's some more interesting output:

sudo rfkill event
# initially:
1341508858.670966: idx 0 type 1 op 0 soft 0 hard 0
1341508858.671014: idx 1 type 2 op 0 soft 1 hard 0
1341508858.671024: idx 2 type 1 op 0 soft 0 hard 0
# hardware switch-off:
1341508862.464313: idx 2 type 1 op 2 soft 0 hard 1
1341508862.469270: idx 0 type 1 op 2 soft 0 hard 1
1341508862.469312: idx 1 type 2 op 2 soft 1 hard 1
# hardware switch-on:
1341508892.690015: idx 2 type 1 op 2 soft 0 hard 0
1341508892.696960: idx 0 type 1 op 2 soft 0 hard 0
1341508892.698356: idx 1 type 2 op 2 soft 1 hard 0
# NM wireless off:
1341508921.532916: idx 0 type 1 op 2 soft 1 hard 0
1341508921.533245: idx 2 type 1 op 2 soft 1 hard 1
1341508921.534261: idx 2 type 1 op 2 soft 1 hard 1
# rfkill unblock 0
1341508991.084537: idx 0 type 1 op 2 soft 0 hard 0
1341508991.084750: idx 2 type 1 op 2 soft 1 hard 0
# NM disable, NM enable, NM wireless on:
1341509044.899252: idx 0 type 1 op 2 soft 0 hard 0
1341509044.899303: idx 2 type 1 op 2 soft 0 hard 0

Whatever the reason may be for the duplicate event of turning device
"phy0" into state soft blocked/hard blocked, the notable difference is
the result after switching off :

Hardware switch-off:
0: sony-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: yes
...
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: yes

NM switch-off:
0: sony-wifi: Wireless LAN
        Soft blocked: yes
        Hard blocked: no
...
2: phy0: Wireless LAN
        Soft blocked: yes
        Hard blocked: yes

Probably the contradicting values of sony-wifi and phy0 caused by NM
serve as an explanation.

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https://bugs.launchpad.net/bugs/1001998

Title:
  Wireless Switch doesn't recover wireless

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