Hi Rick,
ehci-hcd can take three parameters:
log2_irq_thresh (0-6): log2 IRQ latency, 1-64 microframes
park (1-3): park setting; 1-3 back-to-back async packets
ignore_oc (0-1): ignore bogus hardware overcurrent indications
I don't really know what they mean, and I doubt they would help here,
but it may be worth a try. You could create a new file,
/etc/modprobe.d/ehci-hcd.conf:
options ehci-hcd log2_irq_thresh=6 park=3 ignore_oc=1
Then execute:
modprobe -r ehci-hcd
modprobe ehci-hcd
It can hardly get worse.
uhci-hcd is always loaded: it provides USB 1.1 connectivity, i.e.
speeds up to 12 Mbit/s. ehci-hcd provides USB 2.0, speed 480 Mbit/s.
So it probably doesn't make sense to remove it permanently, but just
for test's sake:
modprobe -r ehci-hcd
And permanently (/etc/modprobe.d/ehci-hcd.conf):
blacklist ehci-hcd
Now the device should be detected as full speed instead of high speed.
Yes, full speed is much lower in this case.
Risto
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