Messages in this thread | | | Date | Sat, 7 Jul 2007 22:54:57 -0400 | From | Gerald Britton <> | Subject | Re: PROBLEM: MacBook makes whining noise when usb-uhci active |
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On Sat, Jul 07, 2007 at 10:17:34PM -0400, Alan Stern wrote: > > [2.] Full description of the problem/report: On my MacBook (first generation > > Core Duo 1.83GHz), I can hear a faint whining noise that becomes audible > > when usb-uhci is loaded and remains audible except when the USB ports are in > > use (i.e. the noise temporarily stops when I'm copying music to my iPod). > > You have a USB keyboard, right? So the ports are always in use -- > unless you unplug the keyboard. > > > This problem occurs on both 2.6.21 and 2.6.22-rc7, but does not occur on > > 2.6.18. Unloading usb-uhci when booted in 2.6.22-rc7 makes the whining > > noise stop, but the system is useless in this state for obvious reasons. > > The same whine does occur in OS X that occurs in 2.6.22-rc7 (though it does > > NOT occur in 2.6.18) > > Anyway it's clearly a hardware problem, even if it is triggered by > something in software. About all I can suggest is to surround the > MacBook with something sound-absorbent. (Not very helpful, I agree.)
I have a similar problem with my new Thinkpad X60 Tablet. In this case, I have a high pitched whine which is only caused when USB drivers are loaded, I am on battery, and there are no devices connected to USB. I suspect something involved with CONFIG_USB_SUSPEND (which is enabled) is causing this whine, but I haven't dug deeper to find out a more precise cause.
For reference, I'm running Fedora 7's 2.6.21-1.3228.fc7 x86_64.
-- Gerald
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