webcams not working on usb hub, only directly attached?

[JG <jg (at) cms.ac>]

hi,

i've searched the wiki and v4l-ml archive but nothing appropriate came
up.

i've been trying to get my usb webcam (creative webcam 3, ov511) to
work for some hours until i found out that it only works directly
attached on the mainboard, but not on a usb hub.

is this a known problem or limitation?


i asked a friend and his webcam with spca5xx driver behaves the same,
so it's not related to ov511 but v4l or kernel?

system info:
kernel: 2.6.15.4 (gentoo 2.6.15-r5)
friends kernel: 2.6.16.14 (gentoo 2.6.16-r7)
updated ov511 driver to: v2.32

i've loaded the ov511 module with debug=5 and attached the output of
the cam directly attached and on a usb hub.

i tried to access the device with gqcam (0.9.1b) -v /dev/video0 and
camstream (v0.27pre1). when attached to the hub i get output like:

/dev/video0: No such device
the corresponding debug output is:
> May 12 20:31:49 x90 ov511-2.32/ov511_core.c: [ov51x_open:3822] opening
> May 12 20:31:49 x90 ov511-2.32/ov511_core.c: No sensor is detected yet

there is no problem when attached directly..

$ lsmod | grep ov
ov511                  96264  0
ovcamchip              26568  0
videodev                7360  1 ov511
v4l2_common             4864  1 ov511
i2c_core               17424  4 ov511,ovcamchip,i2c_viapro,nvidia

tx for any infos.
JG

Attachment: ov511_debug5_hub.gz
Description: GNU Zip compressed data

Attachment: ov511_debug5_wo_hub.gz
Description: GNU Zip compressed data

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