Subject: Re: resetting USB ports?
To: Richard Rauch <firstname.lastname@example.org>
From: Steven M. Bellovin <email@example.com>
Date: 04/12/2005 20:02:37
In message <20050412211930.GA4081@olib.org>, Richard Rauch writes:
>I would rather suggest *disabling* IOAPIC.
>I saw exactly your problem on my AMD64 box a year ago or so. Somewhere,
>I got the hint of disabling IOAPIC (I never turned on MPACPI). The problem
>That doesn't prove that it's the same cause but the symptoms were the same.
>The mouse would attach and work for a while, then it would die at some
>random later time while the system was in use. (I believe that the whole
>USB port went south.) This was on a motherboard using an nVidia nForce3
>chipset; others (at least with older nForce3 chipsets) reported similar
>(Actually, depending how I had my PCI cards juggled, I recall that sometimes
>the mouse would be okay, but some other devices would fail to configure. The
>last time that I tried a GENERIC kernel (i.e., with IOAPIC), I still had the
>problem. I've tried MPACPI, but didn't keep it; I can't remember exactly
>what didn't work with it. My faint memory is that the problem was the same
>as with IOAPIC.)
>It might even be worth while removing, or relocating, any PCI cards you
Hmm -- ioapic is disabled in GENERIC now. I could try a GENERIC kernel
and see what happens.
--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb