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My wireless connection is always broken, and it can't receive good signal. I am not sure if the wireless driver caused it.
Is my wireless driver too old? Or there are some other reasons?
My mobile can receive great signal, and my hardware is good too.
Can anyone help me?

System version

  • Distributor ID: Debian
  • Description: Debian GNU/Linux 7.4 (wheezy)
  • Release: 7.4
  • Codename: wheezy
  • 64bit

ifconfig

eth0        
Link encap:Ethernet HWaddr a0:b3:cc:17:3a:26 inet6 addr: fe80::a2b3:ccff:fe17:3a26/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 
Metric:1 RX packets:754884 errors:0 dropped:1 overruns:0 frame:0 TX packets:653093 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 
txqueuelen:1000 RX bytes:1076885286 (1.0 GiB) TX bytes:69749589 (66.5 MiB) Interrupt:41 Base address:0x2000

lo        
Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 
Metric:1 RX packets:30743 errors:0 dropped:0 overruns:0 frame:0 TX packets:30743 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 
txqueuelen:0 RX bytes:19489860 (18.5 MiB) TX bytes:19489860 (18.5 MiB)

ppp0        
Link encap:Point-to-Point Protocol inet addr:39.64.129.250 P-t-P:39.64.128.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 
Metric:1 RX packets:754106 errors:0 dropped:0 overruns:0 frame:0 TX packets:652283 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 
txqueuelen:3 RX bytes:1060248214 (1011.1 MiB) TX bytes:55370661 (52.8 MiB)

wlan0         
Link encap:Ethernet HWaddr 08:ed:b9:5b:a2:fc
inet addr:10.201.139.226 Bcast:10.201.159.255 Mask:255.255.224.0 inet6 addr: fe80::aed:b9ff:fe5b:a2fc/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 
Metric:1 RX packets:28 errors:0 dropped:0 overruns:0 frame:0 TX packets:155 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 
txqueuelen:1000 RX bytes:2269 (2.2 KiB) TX bytes:29331 (28.6 KiB)

iwconfig

wlan0   
IEEE 802.11bgn ESSID:"CMCC"
Mode:Managed Frequency:2.462 GHz Access Point: E4:68:A3:78:8C:30
Bit Rate=1 Mb/s Tx-Power=19 dBm
Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=21/70 Signal level=-89 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:9 Invalid misc:1 Missed beacon:0

eth0        
no wireless extensions.

Device dirver check & report

PCI ID        
14e44727
works?        
Yes
vendor        
Broadcom Corporation
device        
BCM4313 802.11b/g/n Wireless LAN Controller
driver        
brcmsmac
Kernel
v2.6.38-
share|improve this question
    
Have you searched if there is an alternate driver or firmware for this device? The firmware can have a lot of impact on reception quality: sometimes signal is lost because the firmware is buggy or too slow or doesn't use the hardware optimally. The driver can also indirectly have an impact if it doesn't use the firmware optimally. Have you tried with another OS? Otherwise defective hardware is a possibility. –  Gilles Feb 5 at 23:29
    
@Gilles OK, I will try it. thank you! –  code_new Feb 6 at 14:06

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