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