Messages in this thread | | | Date | Sun, 8 Jul 2007 00:41:55 -0400 | From | "Tim Hull" <> | Subject | Re: PROBLEM: MacBook makes whining noise when usb-uhci active |
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After reading the ThinkPad wiki link, I've found that the problem has to do with the C3 and C4 ACPI states. I'm guessing that the 2.6.18 kernel I was using on Debian Etch just happened to not support full power management on my MacBook - hence, the problem didn't occur.
Sorry for all of this - I guess I'll pass this info on to Apple and see if they may be able to fix this with a firmware update (it occurs on OS X too). On 7/8/07, Henrique de Moraes Holschuh <hmh@hmh.eng.br> wrote: > On Sat, 07 Jul 2007, Gerald Britton wrote: > > 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. > > http://www.thinkwiki.org/wiki/Problem_with_high_pitch_noises might give you > some hints, and yes, it is a hardware design problem. > > -- > "One disk to rule them all, One disk to find them. One disk to bring > them all and in the darkness grind them. In the Land of Redmond > where the shadows lie." -- The Silicon Valley Tarot > Henrique Holschuh > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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