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Recover apparently dead USB ports
Authored by: swisswuff on Nov 05, '06 02:40:36AM

I had the problem of "dead" USB mouse particularly with thin cables and dual CRT monitor setups (Mac, Windows or Linux), and I have this problem still occasionally on any OS (Mac, Windows or Linux).

It does not occur on the PS2 connection for some PC mice, and it rarely - but also - happens on USB keyboard connections.

The only OS where I know a real fix - that can be applied in software, on the fly, and right there - is Ubuntu Linux running on my laptop (ASUS A6T). Since it may be possible to apply a similar fix to Mac OS X, I thought it could be interesting in this context. Typically, my external keyboard and the external mouse stop working after a few minutes on my PC running Ubuntu.

However, this is recognized as a software problem, and the solution is a software solution. The commands are as follows and have to be issued as root:

modprobe -r ohci_hcd

modprobe ohci_hcd no_handshake=1

After keying in these two commands, the USB immediately turns back on, and it remains unfreezed until the end of that session (until the machine is turned off).

I guess there must be a way to do something similar on Mac OS X or Windows?



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Recover apparently dead USB ports
Authored by: Zeitkind on Nov 14, '06 01:46:25AM

For old systems with ADB, there was a little tool from Apple to reset the bus. Those utilities often come with developer stuff and SDKs, so it might worth looking into that direction. A simple modprobing the kernel modules won't work on PPC hardware I guess, but I never tried it.



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