We are attempting to debug an issue that we are seeing with some devices where the camera module starts/stops working sometimes after a power cycle. A working camera can stop working and a non working camera can start working without any change to the device.
With the devices that no longer take photos we get messages as shown below in the kernel log:
[ 20.153600] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[ 20.398490] usb 1-1: unable to read config index 0 descriptor/all
[ 20.403538] usb 1-1: can't read configurations, error -32
[ 20.543572] usb 1-1: new high-speed USB device number 3 using ci_hdrc
[ 20.746370] usb 1-1: device descriptor read/all, error -71
[ 20.883987] usb 1-1: new high-speed USB device number 4 using ci_hdrc
[ 21.333593] usb 1-1: device not accepting address 4, error -71
some other devices will show
[ 20.243591] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[ 20.448903] usb 1-1: unable to read config index 0 descriptor/start: -32
[ 20.454553] usb 1-1: chopping to 0 config(s)
[ 20.478077] usb 1-1: no configuration chosen from 0 choices
On the functioning devices we see this instead
[ 19.933590] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[ 20.294390] uvcvideo: Found UVC 1.00 device MikrOkularFullHD (053a:9230)
[ 20.308968] input: MikrOkularFullHD as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1:1.0/input/input1
[ 20.320578] evbug: Connected device: input1 (MikrOkularFullHD at usb-ci_hdrc.1-1/button)
[ 20.327982] usbcore: registered new interface driver uvcvideo
[ 20.332528] USB Video Class driver (1.1.1)
We've tried rebooting the device, leaving it off for a few minutes then turning it back on (in case overcurrent was the issue) - but none of that has worked so far.
We are running Linux version 4.9.11-1.0.0+gc27010d