wifi failed after hibernate

[Gerard Robin]

Hello,
when my laptop starts, the connection wifi works fine, after that my 
laptop has hibernated, when I restart, all works fine except the 
connection wifi.

I have dual boot (linux etch, windows) with grub in the mbr.
lspci: Ethernet controller: Atheros Communications, Inc. AR5005G 802.11abg NIC 
(rev 01)

Can someone help me to solve this problem ?

tia.
--
Gérard