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bugreport brcmsmac weak signal

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Hi,

I have problems with my Broadcom BCM4313 wifi card while using brcmsmac module.

The wifi signal is terribly weak. When the distance between my laptop and AP is 
more than ~5 m the network is not visible at all. When the laptop is closer, 
it connects, but it is very slow due to weak signal. I have to sit next to AP 
when I want link quality more than 60/70.

If I use Broadcom hybrid driver - wl - it works normally (but has different 
problems...).

I tried to use three different wifi networks with this combination and all of 
them had the same problem.

-----
My setting:
$ uname -r
3.8.0-rc1

I applied the patch from:
http://marc.info/?l=linux-wireless&m=135635090121154&w=2

The same with 3.5.7 gentoo kernel.
-----
wavemon info: (with brcmsmac, ~5 m between my laptop and the ap)

┌─Interface────────────────────────────────────────────────
│wlan0 (IEEE 802.11bgn, WPA/WPA2),  ESSID: "ihome"         
├─Levels───────────────────────────────────────────────────
│                                                          
│link quality: 23/70                                       
│======================                                    
│                                                          
│signal level: -87 dBm (2,00 pW)                           
│========                                                  
│                                                          
│                                                          
├─Statistics───────────────────────────────────────────────
│RX: 3 8178(2,41 MiB), invalid: 0 nwid, 0 crypt, 0 frag, 3 misc
│TX: 4 1789(779,619KiB), mac retries: 31, missed beacons: 0
├─Info─────────────────────────────────────────────────────
│mode: Managed,  access point: (not relevant :-))           
│freq: 2,437 GHz, channel: 6,  bitrate: 5,5 Mbit/s         
│power mgt: off,  tx-power: 19 dBm (79,43 mW)             
│retry: long limit 7,  rts/cts: off,  frag: off            
│encryption: n/a (requires CAP_NET_ADMIN permissions)      
├─Network──────────────────────────────────────────────────
│wlan0 (UP RUNNING BROADCAST MULTICAST)                    
│mac: (not relevant :-)), qlen: 1000                        
│ip: 192.168.1.103/24,  bcast: 255.255.255.255             
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