I recently purchased a STK1160 based USB video capture device (Sabrent USB-AVCPT). I have tested it on a windows computer and it works fine, but not on any linux box I have tried. lsusb reports: Bus 002 Device 003: ID 05e1:0408 Syntek Semiconductor Co., Ltd STK1160 Video Capture Device I am running Linux Mint with a 4.2.0 based kernel on AMD64: $ uname -a Linux home 4.2.0-30-generic #36~14.04.1-Ubuntu SMP Fri Feb 26 18:49:23 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux The exact results vary in different capture programs, but i always seems to be something like a timeout waiting for the first frame. I grabbed the driver source and added a few printk's to see what is going on. The first time streaming is started it gets a single 8 byte isochronous packet similar to: 80 0D 00 00 3D 61 0B 00 This is followed by a series of 4 byte packets (which the source code refers to as "empty packets." These packets continue until streaming is stopped. 00 01 00 00 00 02 00 00 ... 00 3E 00 00 00 3F 00 00 00 00 00 00 00 01 00 00 ... The second time (and all subsequent times) streaming is started I seem to get a single 8 byte packet similar to: A0 0E 00 00 3D 61 0B 00 Each time streaming is started the second number appears to be incremented. The is again followed by the same sequence of 4 byte packets as mentioned before (all zeros, except the second byte increments wrapping around after 3F). I am at a bit of a loss as to where to continue debugging this. Any suggestions will be appreciated. -- 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
