I'm building a multi-seat system, with 6 video cards intended to be all
run separately, so 6 people can sit down at the machine at the same
time. This for a lab to be installed in a school in the middle of
Bolivia next month.
I've gotten the X issues worked through (but not entirely solved), but
now I'm running into USB issues. Specifically, I can get all the
keyboards to work just fine, they have never given me any problems at all.
However, the mice are a whole other story. I've seen at most 3 mice
work at any given time, and plugging in a fourth will sometimes result
in the latest mouse working, sometimes not. Either way the total number
of working mice stays at 3 or below.
Each keyboard and mouse pair is attached to a dedicated USB2 hub, with
each hub dedicated a port on the motherboard's root hub, conveniently
labeled 1..6 in the resulting USB device paths.
Plugging in the three hubs, one at a time, with keyboard and mouse
already attached, generally results in the first two mice working and
the third not. Sometimes it's the first mouse that stops working and
the last one starts working. Rarely they all work.
Starting with just the hubs, I can plug in the keyboards one at a time,
no problems. Then start adding mice, testing each one as I go, and I
get similar results, sometimes they all work, sometimes it's the first
or last mouse that stops working.
I haven't been able to discern anything out of the ordinary from the
kernel logs, unfortunately. My testing as to whether or not the devices
work is a python script I wrote, using an 'evdev.py' out on the net,
which will open *every* /dev/input/event* and check for updates every
100msec, printing out the new data if there are any changes. Some
-HUP's patched into the hotplug system *usually* inform my script of new
or removed devices, at which point it tosses the lot and re-opens
everything.
Part of the puzzle is almost certainly that sometimes this -HUP doesn't
work, so I have to restart the script to see devices that indeed work.
there are no protections against nested -HUPs in my script, so that
makes me think that somewhere the hotplug scripts are screwing up when
there are two or more running in parallel, e.g. at bootup when
theoretically all 6 hubs, keyboards, and mice are all triggering hotplug
at the same time.
For reference I'm using the latest stock Ubuntu 5.04 kernel, which
currently is linux-image-2.6.10-5-386 (2.6.10-34.3). I can try a newer
kernel as needed.
If anyone has any insight into what on earth is going on, I would very
much appreciate it. I have a dog&pony show at 6pm PST Friday and I'd
love to have this solved by then, if possible.
TIA,
Omega
aka Erik Walthinsen
[EMAIL PROTECTED]
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