Pogoplug Pro: unable to probe gspca webcams

[fovea1959]

(cross posted from the Pogoplug PRO forum)

Relatively fresh boot disk:

$this->bbcode_second_pass_code('', '
[root@pogo 2.6.31.6_SMP_820]# uname -a
Linux pogo 2.6.31.6_SMP_820 #6 SMP Thu Jun 14 19:49:57 CDT 2012 armv6l GNU/Linux
')

I hand built the missing modules.builtin:

$this->bbcode_second_pass_code('', '
find . | grep ko | cut -f 2,3 -d \. | cut -f 2- -d \/ > modules.builtin
')

I can now load the gspca_main module:
$this->bbcode_second_pass_code('', '
[root@pogo 2.6.31.6_SMP_820]# modprobe gspca_main
[root@pogo 2.6.31.6_SMP_820]# lsmod
Module Size Used by
gspca_main 23232 0
videodev 35712 1 gspca_main
i2c_core 22580 1 videodev
v4l1_compat 15172 1 videodev
bootled_module 1472 0
gmac 40012 0
mii 6200 1 gmac
')

I have 3 gspca supported webcams:

$this->bbcode_second_pass_code('', '
[root@pogo 2.6.31.6_SMP_820]# lsusb
...
Bus 001 Device 010: ID 046d:0840 Logitech, Inc. QuickCam Express
Bus 001 Device 009: ID 0733:0401 ViewQuest Technologies, Inc. CS330 Webcam
Bus 001 Device 008: ID 041e:401c Creative Technology, Ltd Webcam NX [PD1110]
')

If all is working, shouldn't I be seeing message like this when I plug in a webcam?

$this->bbcode_second_pass_code('', '
[ 868.220522] gspca: main v2.6.0 registered
[ 868.231488] gspca: probing 046d:08da
')

I'm seeing "registered", but not the "probing"... Am I doing something wrong?