I'm trying to use libuvc_camera to get my usb camera working on a nodelet to reduce CPU usage, but I'm having a lot of trouble. I've brute-forced my way through most of my problems, but now I'm stonewalled. Every time I try to boot the launch file I just get

unsupported descriptor subtype: 3
unsupported descriptor subtype: 3
uvc_get_stream_ctrl_format_size: Invalid mode (-51)

Here's my launch file:

<launch>
  <group ns="camera">
    <node pkg="libuvc_camera" type="camera_node" name="mycam">
      <!-- Parameters used to find the camera -->
      <param name="vendor" value="0x2560"/>
      <param name="product" value="0xc110"/>
      <param name="serial" value="32C0D5400"/> 
      <!-- If the above parameters aren't unique, choose the first match: -->
      <param name="index" value="0"/>

      <!-- Image size and type -->
      <param name="width" value="1280"/>
      <param name="height" value="960"/>
      <!-- choose whichever uncompressed format the camera supports: -->
      <param name="video_mode" value="yuyv"/> <!-- uncompressed/yuyv/nv12/jpeg -->
      <param name="frame_rate" value="10"/>

      <param name="timestamp_method" value="start"/> <!-- start of frame -->
      <param name="camera_info_url" value="file:///home/usr/.ros/camera_info/calibration.txt"/>

      <param name="auto_exposure" value="1"/> <!-- use aperture_priority auto exposure -->
      <param name="auto_white_balance" value="false"/>
    </node>
  </group>
</launch>

And here is the error:

process[camera/mycam-1]: started with pid [22107]
unsupported descriptor subtype: 3
unsupported descriptor subtype: 3
uvc_get_stream_ctrl_format_size: Invalid mode (-51)
[ERROR] [1460040590.634224143]: check video_mode/width/height/frame_rate are available
[camera/mycam-1] process has died [pid 22107, exit code -11, cmd /home/davelkan/locus/babbage/devel/lib/libuvc_camera/camera_node __name:=mycam __log:=/home/davelkan/.ros/log/48edeb92-fc35-11e5-9a05-0862664a2a25/camera-mycam-1.log].
log file: /home/davelkan/.ros/log/48edeb92-fc35-11e5-9a05-0862664a2a25/camera-mycam-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete
done

And here's the relevant data from lsusb -v

Bus 004 Device 013: ID 2560:c110  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 ?
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0         9
  idVendor           0x2560 
  idProduct          0xc110 
  bcdDevice            0.00
  iManufacturer           1 e-con Systems
  iProduct                2 e-con's 1MP Monochrome Camera
  iSerial                 3 2C0D5400

FAQS:

• I have confirmed my device is uvc compliant

• I have confirmed uvc is correctly installed

• I have successfully gotten this camera working with usb_cam