Whine when EHCI controller enabled in BIOS

[Bob McConnell]

On Behalf Of Jason Morgan
> On Sun, Jun 08, 2008 at 09:40:17PM -0600, James wrote:
>> I have a high pitched whine coming from my motherboard when the EHCI
>> USB 2.0 controller is enabled in the BIOS.  The whine only starts
once
>> FreeBSD 7.0-RELEASE is halfway through booting.
>> 
>> The whine also goes away when I plugin a USB drive in with EHCI
>> controller enabled (usb keyboard and mouse being already plugged in).
>> 
>> Is this a hardware problem, or could it possibly be software
related???
> 
> I can't imagine this is a software issue. Sounds strange. Have you
> tried to see if it isn't a fan issue? We have some Dell GX280s with a
> bad batch of motherboards at my university---under specific conditions
> (e.g., using certain video cards) the system fan will spin up 'til the
> system sounds like it's about to take off.

One of the device probes during startup could be sending what appears to
be a full speed command to the fan controller.

Bob McConnell