Comment 9 for bug 58247

I've got the same problem on feisty fawn (7.04): after the second resume from hibernation, iwconfig show:
  lo no wireless extensions.
  eth1 no wireless extensions.
  eth0 no wireless extensions.

Simply restarting the ipw3945 daemon solved the problem. (from a root shell I've just typed: "ipw3945d-2.6.20-15-generic"). The output of this command is:

ipw3945d - regulatory daemon
Copyright (C) 2005-2006 Intel Corporation. All rights reserved.
version: 1.7.22
Intel PRO/Wireless 3945ABG Network Connection found at:
 /sys/bus/pci/drivers/ipw3945/0000:04:00.0
Daemon launched as pid 10332. Exiting.

A new iwconfig found the right interfaces:

lo no wireless extensions.
eth1 unassociated ESSID:off/any
          Mode:Managed Frequency=nan kHz Access Point: Not-Associated
          Bit Rate:0 kb/s Tx-Power:16 dBm
          Retry limit:15 RTS thr:off Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:0 Signal level:0 Noise level:0
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0
eth0 no wireless extensions.

I attach the LSPCI output for more information on my hardware.

The kernel I'm using is: 2.6.20-15-generic #2 SMP Sun Apr 15 07:36:31 UTC 2007 i686 GNU/Linux