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I updated my Ubuntu 12.10 (kernel 3.7.9) to kernel 3.8 and noticed that my wifi connection from 150Mbps went to 72.2 Mbps.

Can someone help me to solve it ?

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SOLVED !

sudo  iwconfig wlan0 rate 150M fixed

also changed operation channel of the Wi-fi router ! Now :

wlan0     IEEE 802.11bgn  ESSID:"Cvetybaby"  
          Mode:Managed  Frequency:2.432 GHz  Access Point: C8:3A:35:2A:5F:C0   
          Bit Rate=150 Mb/s   Tx-Power=14 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-39 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:16482  Invalid misc:2   Missed beacon:0
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