Hi, On Fri, Dec 5, 2014 at 1:46 PM, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > Hi Grazvydas, > > On Thursday 06 November 2014 00:29:53 Grazvydas Ignotas wrote: >> On Wed, Nov 5, 2014 at 4:05 PM, Laurent Pinchart wrote: >> > Would you be able to capture images from the C920 using yavta, with the >> > uvcvideo trace parameter set to 4096, and send me both the yavta log and >> > the kernel log ? Let's start with a capture sequence of 50 to 100 images. >> >> I've done 2 captures, if that helps: >> http://notaz.gp2x.de/tmp/c920_yavta/ >> >> The second one was done using low exposure setting, which allows >> camera to achieve higher frame rate. > > Thank you for the log, they were very helpful. They revealed that the USB SOF > (Start Of Frame) counter values on the device and host side are not in sync. > The counters get incremented are very different rates. What USB controller are > you using ? 00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 01) (prog-if 20 [EHCI]) Subsystem: Micro-Star International Co., Ltd. [MSI] Device 7592 Flags: bus master, medium devsel, latency 0, IRQ 23 Memory at fe9fbc00 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port: BAR=1 offset=00a0 Kernel driver in use: ehci-pci If it helps, I could try on an ARM board, currently don't have any other x86 hardware around. -- Gražvydas -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
