Hi Ben, On Wednesday 11 July 2007, Ben Lau wrote: > Hi Laurent, > > On 7/11/07, Laurent Pinchart <[EMAIL PROTECTED]> wrote: > > The timeout is specified in milliseconds. 300ms should have been more > > than enough. The V-Gear Talkcam MX6 AF might be a bit slow to answer > > though, and upgrading your kernel might have introduced latencies in URB > > submission, or removed latencies in the timeout handling code. > > yes, the usb_start_wait_urb() was reimplemented in 2.6.19 to use > completion timeout instead of timer. I think it is probably the source > of my problem.
I had a look at the git log. You're right, that's probably the reason. I suspect the V-Gear webcam to have borderline timings, and the usb_start_wait_urb() reimplementation made it fall over the edge. > > I'd like to avoid setting the default timeout too high. Could you please > > test with intermediate values ? > > No problem. The lowest stable timeout I could use is 350ms. Below the > value is quite unstable. I will continue the test for few more days. I'll raise the default value in the driver, or come up with a way to set dynamic timeouts. Please let me know the outcome of your tests. Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
