Hello.
- When two cameras are connected to the computer the USB sound-card
(Creative Audigy 2 NX) stops working ("Permission denied"). If I
detach the cameras during boot and attach them at some later stage
then both the cameras and the sound-card work together without any
problems. This work-a-around does not solve my problem since the
system needs to run without maintenance for several months, with
reboot being the only form of administration.
Any ideas / help?
I did a lot of rebooting with different configurations and it seems that
the problem is not in the pwc driver.
Here is a list of things I tried and how they worked (always reboot
between configuration changes):
1) Attach two cameras and the sound-card to the USB-hub. Cameras work,
but the sound-card does not respond ("permission denied").
2) Attach one camera and the sound-card to the USB-hub. Cameras work,
but the sound-card does not respond ("permission denied").
3) Remove the pwc driver from the driver tree, check with "lsmod" that
is does not get loaded at boot (or after that). Attach two (or one)
cameras and the sound-card to the USB-hub. The sound-card does not
respond(!)
4) Detach both cameras from the USB hub and use the sound-card alone.
The sound-card works.
5) Put the pwc drivers back the driver tree. Move the sound-card to the
PCs USB port (in the back of the PC). Place the cameras into
non-adjacent ports in the USB hub. Now cameras and the sound-card work ok.
My original (problematic) setup was: Have the sound-card and the HUB
connected to the front of the PC and have the cameras attached to
adjacent ports to the USB hub.
Based on case 3 the problem is probably not in the PWC driver, but in
the general USB management.
Now I am waiting to get third camera and if it works with all the
others, then I'll be happy with this reliable setup.
I guess it would be useful to hunt the source of problem and fix it, but
with the current schedule I'll just have to create something that
(barely) works... And apparently the problem (or parts of it) are not
related to the pwc driver so this list might not be the proper place for
such work.
--
====================================================
Tommi Ilmonen
Researcher
Helsinki Institute for Information Technology (HIIT)
Tel: +358-50-3841543
====================================================
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