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 Forum index » House Training » HOWTO ( Solutions )
Forcing USB 1.0 operation
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ravensrest


Joined: 22 Feb 2008
Posts: 321
Location: Hood Canal, WA

PostPosted: Tue 15 Mar 2011, 21:33    Post subject:  Forcing USB 1.0 operation  

I recently bought a couple of SD memory readers. Although they claimed to be USB 2.0 compatible, they would not function on my main computer. I discovered by running them on one of my older computers that they would run on a machine that was only USB 1.0 compatible. I needed a way to force my newer computer to run in USB 1.0 mode. I discovered this command:
Code:
modprobe -r ehci-hcd

It unloads the high speed driver and allows my readers to function properly. May be of some use to some of you on occasion.

To reload the high speed driver after using the slow SD readers, enter this command in a terminal:
Code:
modprobe ehci-hcd

BS
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Dougal


Joined: 19 Oct 2005
Posts: 2505
Location: Hell more grotesque than any medieval woodcut

PostPosted: Thu 17 Mar 2011, 16:48    Post subject:  

Have you tried looking at the output of dmesg after connecting them? It seems strange to me that you'd have to cripple your system for them to work (and is anything made these days really not USB2??).
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