I found in recent kernel versions, I think somewhere between 2.6.29.3
and 2.6.30.3, pwc_set_shutter_speed regressed.
I was able to fix it with this one-line change
(drivers/media/video/pwc/pwc-ctrl.c line 755 in 2.6.30.5 source):
ret = send_control_msg(pdev,
SET_LUM_CTL, SHUTTER_MODE_FORMATTER, &buf, sizeof(buf));
change to
ret = send_control_msg(pdev,
SET_LUM_CTL, SHUTTER_MODE_FORMATTER, &buf, 1);
I hope you find this information useful.
Thank you
Jef Treece
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