Rogier Wolff wrote:
What happens if you plug the mice into the motherboard directly. (for
now: No keyboards!)
Tried various combinations of direct and hub (powered and not)
connections with no luck in removing the non-deterministic behavior.
Then I noticed that both ehci_hcd and uhci_hcd were being loaded by the
Ubuntu scripts. Some messing around with them yields the answer:
ehci_hcd is broken.
uhci_hcd works just fine so far every single time, with the
configuration I'm after in the long run: one hub per workstation, each
hub connected to the root hub. I don't even need to power the hubs
directly, which is *great* for both cable and power management. Not
sure what the official power usage is on the mice, but I suspect each
keyboard/mouse pair isn't more than 25mA, and IIRC I have a budget of
500mA total off the root hub.
While I'd like to see ehci_hcd working before I leave (Sept. 4), I don't
need the 480Mbps capability currently, so I've just blacklisted ehci_hcd
and all is well.
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