YES, I am talking about the system beep at start up.
YES, this beep is a bios signal.
NO, you don't need a special bios setting. The sound button disables it to AND 
the red light indicates that the notebook is complitely quiet. There are some 
other beeps, for instance after resuming from suspend to disk. And they are 
even off if the red light is on. The state of the red light (sound on/off) is 
stored somewhere in the bios. It keeps its state also after a reboot. If the 
light was on before shutdown it keeps this state (on) also after powering on 
again. BUT: this behavior is only valid for Windows. If the state of this red 
light was off before doing a shutdown it is off also after power on. You can 
press the sound button after power on during the first BIOS messages so that 
the light is switched on and you get rid of the BIOS beep. But then comes 
Linux. If you select Linux in Grub the light gets off almost immediately and 
you will hear every system beep afterwards. Pressing the sound button in Linux 
enables/disables only the sound but not enables the system beeps. The annoying 
thing is not the missing red light but these beeps especially if you are in a 
silent environment or a train. And: it has worked some times before in Ubuntu 
9.10! So, why not now with a recent kernel?

DM

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https://bugs.launchpad.net/bugs/576849

Title:
  Lenovo T400s Lucid turns sound on though it is turned off, sound key LED 
doesn't work

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