In case it may help, on my laptop dell d630 (kubuntu gutsy) with

0c:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or
AGN Network Connection (rev 61)

then

1. at work I have a non encrypted wifi network, which works without
problem

2. there is also a encrypted network, requiring WPA enterprise/ TTLS/PAP
password. Each time I try to connect, the network is detected but then
the drivers fails immediately with

[  564.416000] wlan0: authenticated
[  564.416000] wlan0: associate with AP ***hiden**
[  564.416000] wlan0: RX ReassocResp from ***hidden** (capab=0x431 status=0 
aid=239)
[  564.416000] wlan0: associated
[  564.424000] iwl4965: TX Power requested while scanning!
[  564.424000] iwl4965: Error setting Tx power (-11).
[  564.424000] iwl4965: TX Power requested while scanning!
[  564.424000] iwl4965: Error setting Tx power (-11).
[  569.428000] iwl4965: Microcode SW error detected.  Restarting 0x82000000.
[  571.428000] wlan0: failed to restore operationalchannel after scan
[  571.428000] iwl4965: No space for Tx
[  571.428000] iwl4965: Error sending REPLY_ADD_STA: iwl_enqueue_hcmd failed: 
-28
[  571.428000] iwl4965: No space for Tx
[  571.428000] iwl4965: Error sending REPLY_TX_LINK_QUALITY_CMD: 
iwl_enqueue_hcmd failed: -28
[  571.428000] iwl4965: No space for Tx
[  571.428000] iwl4965: Error sending REPLY_TX_PWR_TABLE_CMD: iwl_enqueue_hcmd 
failed: -28
[  578.660000] iwl4965: REPLY_ADD_STA failed
[  594.340000] wlan0: disassociate(reason=3)

-- 
[Gutsy] Intel 4965AGN wireless connection dies
https://bugs.launchpad.net/bugs/149214
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