This line in /var/log/messages gives it away:

May 20 09:25:39 jake-tablet kernel: [ 1919.176000] eth1: Radio is
disabled by RF switch.

I searched for this and found that when my laptop resumes from sleep,
for some weird reason the WiFi radio is disabled. I downloaded and
installed 'acerhk' which makes my Acer's HotKeys (including a wireless
switch) work. So now after resume, I can press the appropriate hotkey (a
couple of times) until the switch goes back to 0 (meaning not-disabled,
i.e. 'on').

To check whether on or not I do:
$ cat /sys/bus/pci/drivers/ipw2100/*/rf_kill

... this tells me the state of the rf switch, with possible values:

0 = RF kill not enabled (radio on)
1 = SW based RF kill active (radio off)
2 = HW based RF kill active (radio off)
3 = Both HW and SW RF kill active (radio off)

... 0 is what I want. When the laptop resumes from sleep though, it
defaults to 2.

The Acer HotKey program can be downloaded from here:
http://www.cakey.de/acerhk/

After downloading and 'make' 'make install' a 'modprobe acerhk' is also
needed as root.

Still, this is still a bug. Its taken me a few hours to figure this out
and have stretched my technical knowledge. Best of luck if my gran
wanted to get it working.

-- 
Wireless not working after suspend (S3) with ipw2100
https://bugs.launchpad.net/bugs/115743
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