[Gllug] What makes a USB device switch back to 1.1?

John Winters john at sinodun.org.uk
Tue Jul 5 17:38:32 UTC 2011

I hit an interesting problem at the weekend.  A 2 TB Seagate USB drive 
plugged into a nearly new Gigabyte motherboard would only work at 12 
mb/s.  Looking at /var/log/syslog, whichever port it was plugged into a 
message appeared saying it needed to be plugged into a high speed hub in 
order to get anything better.

The same drive plugged into a much older computer works fine at USB 2.0 

What might be making the new one run slowly?  I tried both sockets on 
the motherboard, and front-panel ones which are connected to header pins 
on the m/b.  Could it be other USB devices on the same machine (keyboard 
and mouse)?  Faulty wiring?

I've checked the motherboard's BIOS setup screens.  According to the 
documentation for the m/b there should be options to turn USB 2.0 on and 
off, but they simply aren't there in the actual screens.

Anyone any experience of what causes this sort of thing?

Gllug mailing list  -  Gllug at gllug.org.uk

More information about the GLLUG mailing list