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I'm unable to make my wireless adapter work in 11N mode. I have Intel 4965AGN card on bord but it works only in 11G mode. On my router N mode is enabled.

4065AGN iwconfig 
IEEE 802.11abgn  ESSID:"Cisco_saikas"  
Mode:Managed  Frequency:2.447 GHz  Access Point: C0:C1:C0:21:26:87   
Bit Rate=54 Mb/s   Tx-Power=15 dBm   
Retry  long limit:7   RTS thr:off   Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70  Signal level=-37 dBm  
Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
Tx excessive retries:5  Invalid misc:736   Missed beacon:0

USB 11N iwconfig
IEEE 802.11bgn  ESSID:"Cisco_saikas"  Nickname:"rtl_wifi"
Mode:Managed  Frequency:2.447 GHz  Access Point: C0:C1:C0:21:26:87   
Bit Rate:150 Mb/s   Sensitivity:0/0  
Retry:off   RTS thr:off   Fragment thr:off
Encryption key:****-****-****-****-****-****-****-****   Security mode:open
Power Management:off
Link Quality=97/100  Signal level=96/100  Noise level=0/100
Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
Tx excessive retries:0  Invalid misc:0   Missed beacon:0

Any ideas what’s wrong? My adapter worked in 11N mode until I have install Ubuntu 12.04

share|improve this question
    
That particular card hasn't worked well in the 11n mode for years. What have you used before switching to 12.04? –  mikewhatever Mar 23 '13 at 13:29
    
It was 11.04, I believe. I have not used this PC for a while. But as I remember only with with 11.xx this card worked in N mode. –  Saigunas Mar 23 '13 at 13:42
    
I've asked the same question before. Basically, Intel just has to step up and fix its driver, which is unlikely to happen. The hardware is old, and Intel is known to have notoriously bad Linux support for, at least, some of its hardware: gma500, i8xx graphics, gma3xxx, 4965 and 5100 wireless. –  mikewhatever Mar 23 '13 at 15:29
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