I "solved" the problem. :)
With the usb debug messages on I kept seeing this error :
usb 5-1: new high speed USB device using ehci_hcd and address 3
ehci_hcd 0000:00:10.4: Unlink after no-IRQ? Controller is probably using the
wrong IRQ.
This was followed by lots of timouts and "device not accepting address"
errors.
So I switched off ACPI's IRQ routing ("acpi=noirq" in the GRUB bootloader
config) and now I'm getting sustained transfer rates of 160 Mbps.
Yet again ACPI causes another mess - just the type of thing that puts off
potential desktop Linux users. How many non-technical users would sit for
several days recompiling kernels and fiddling with settings to try track down
the problem?
Let me go find where the ACPI boys hang out ... :)
Thanks for the help
Paul
P.S. I'm attaching a bit of the dmesg output so that a search engine can pick
it up in case someone else runs into the same problem.
ehci_hcd 0000:00:10.4: port 1 high speed
ehci_hcd 0000:00:10.4: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT
usb 5-1: new high speed USB device using ehci_hcd and address 3
ehci_hcd 0000:00:10.4: Unlink after no-IRQ? Controller is probably using the
wrong IRQ.
usb 5-1: khubd timed out on ep0in len=18/64
ehci_hcd 0000:00:10.4: port 1 high speed
ehci_hcd 0000:00:10.4: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT
usb 5-1: khubd timed out on ep0out len=0/0
usb 5-1: khubd timed out on ep0out len=0/0
usb 5-1: device not accepting address 3, error -110
ehci_hcd 0000:00:10.4: port 1 high speed
ehci_hcd 0000:00:10.4: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT
usb 5-1: new high speed USB device using ehci_hcd and address 4
usb 5-1: khubd timed out on ep0in len=18/64
ehci_hcd 0000:00:10.4: port 1 high speed
ehci_hcd 0000:00:10.4: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT
usb 5-1: khubd timed out on ep0out len=0/0
usb 5-1: khubd timed out on ep0out len=0/0
usb 5-1: device not accepting address 4, error -110
ehci_hcd 0000:00:10.4: port 1 high speed
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