[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
speeds.
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?
Cheers,
John
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