Hello, maybe a different issue, but...

I have a DELL D630 with the ipw3945 for a week now.
Wifi works fine with vista (have not used it much though.)
Had issues with SL5. I found in my /var/log/messages:


Oct  4 10:58:11 xxxx kernel: ipw3945: Microcode SW error detected. 
Restarting.
Oct  4 10:58:11 xxxx kernel: ipw3945: Error Reply type 0x000000FF cmd TX 
(0x1C) seq 0x0000 ser 0x00030000
Oct  4 10:58:12 xxxx kernel: ipw3945: Can't stop Rx DMA.
Oct  4 10:58:12 xxxx NetworkManager: <WARNING> 
nm_device_802_11_wireless_get_essid (): error getting ESSID for device 
eth1: Resource temporarily unavailable

After googleing I tried the firmware ipw3945-ucode-1.14.2 I pulled from 
intel. (dropped the ipw3945.ucode in /lib/firmware where /etc/firmware/ 
had a link to it.) No more Microcode SW error. My connection seems 
stable. Working for a day now. I'm using WPA(PSK).

Also I have:

iwconfig eth1:
eth1      IEEE 802.11g  ESSID:"Drift"
           Mode:Managed  Frequency:2.412 GHz  Access Point: xxxxxx
           Bit Rate:54 Mb/s   Tx-Power:15 dBm
           Retry limit:15   RTS thr:off   Fragment thr:off
           Power Management:off
           Link Quality=90/100  Signal level=-44 dBm  Noise level=-45 dBm
           Rx invalid nwid:0  Rx invalid crypt:1  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:259   Missed beacon:0

iwlist eth1 scan:
eth1      Scan completed :
           Cell 01 - Address: xxxxxxx
                     ESSID:"2003"
                     Protocol:IEEE 802.11b
                     Mode:Ad-Hoc
                     Channel:11
                     Encryption key:off
                     Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
                     Quality=63/100  Signal level=-69 dBm  Noise 
level=-69 dBm
                     Extra: Last beacon: 198ms ago
           Cell 02 - Address: xxxxxxx
                     ESSID:"Drift"
                     Protocol:IEEE 802.11bg
                     Mode:Master
                     Channel:1
                     Encryption key:on
                     Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                               11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                               48 Mb/s; 54 Mb/s
                     Quality=88/100  Signal level=-45 dBm  Noise 
level=-45 dBm
                     IE: WPA Version 1
                         Group Cipher : TKIP
                         Pairwise Ciphers (1) : TKIP
                         Authentication Suites (1) : PSK
                     Extra: Last beacon: 261ms ago


Hope this helps.
Robert