audio not working after standby

I installed X64 home premium and I got an audio issue: when I boot first time the audio is working properly but once the laptop goes to stadby, after I switch it on again I can't hear anything and I have to reboot to make the audio working. I installed all the drivers but did not help, what is the explanation of this problem? Anyone had similar experience?

Tom

Toshiba satellite P100-160
x64 4 Gb ram

Hi!
I've got the same problem! Everything is just fine, until I switch it on after standby.
Sometimes, just closing all the programs that "use" sound (if I let WMP, youtube and a game running for example, closing them all when I turn it on again) works, and I got sound again, but its just annoying. And sometimes, even that doesnt work. I searched the solution but I dont find it.

BTW, I have a Toshiba Satellite too ?!! although another model > P200-1HM
Coincidence??