Somebody in the thread at some point said:
Aug 28 19:49:34 proteus kernel: bcm43xx_mac80211: !WARNING! Idle-TSSI phy->cur_idle_tssi measuring failed. (cur=0, tgt=62). Disabling TX power adjustment.
Mode:Managed Frequency:2.437 GHz Access Point:
00:18:39:7A:B4:C0 Bit Rate=54 Mb/s
Bit Rate=1 Mb/s
How far away are you from the AP? I notice that the Bit Rate changed between "before and after"...
-Andy