Webcam not working on Gazp7

[imnotanerd]

I used my webcam only once yesterday to see if it works and the quality. I opened up Cheese, and it worked! Not today, opened Cheese again, and it gives me a message saying "No device found." But how is that possible? I didn't do anything to it! I've looked this over already through google, and I'll output what `lsusb` gives me.

lsusb:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub

No webcam there to be found. There was also the key with the camera on it (F10), and I clicked that, and still nothing. I don't have any other operating systems to test this on. It worked once, what's wrong now?!

[jakobcreutzfeldt]

Hmmm....by any chance was there a kernel update? Just as a sanity check, try restarting the system (if you haven't already).

[imnotanerd]

You know what? I actually did update the kernel. I followed the pinned thread atop the threads page last night. Webcam worked before that, now it doesn't.

[jakobcreutzfeldt]

That's a start then
Have you restarted the system since the kernel update? Sometimes (often, in my experience at least) USB devices like to stop working after an update until the system is rebooted.

If that doesn't help, best to wait for a System76 rep because they'd probably know a lot better than me!

[imnotanerd]

Yep, power cycled a few times already. Let the wait begin!

[jakobcreutzfeldt]

Could you please post the command-line output of

dmesg | grep BisonCam
dmesg | grep uvcvideo

[jakobcreutzfeldt]

Also try running this:

gst-launch-0.10 v4l2src ! xvimagesink

...from a commandline. What it does is open a very basic GStreamer pipeline, using video4linux (what webcams use) as a source and dropping it into a simple Xv (X Windows video extension) sink. If it works, a window should pop up and you should see yourself. If it doesn't then that means GStreamer isn't able to open a v4l stream for some reason.

Please post any output to the commandline produced by this command as well!

[imnotanerd]

dmesg | grep BisonCam

imnotanerd@sys76laptop:~$ dmesg | grep BisonCam
imnotanerd@sys76laptop:~$

dmesg | grep uvcvideo

imnotanerd@sys76laptop:~$ dmesg | grep uvcvideo
imnotanerd@sys76laptop:~$

gst-launch-0.10 v4l2src ! xvimagesink

imnotanerd@sys76laptop:~$ gst-launch-0.10 v4l2src ! xvimagesink
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Cannot identify device '/dev/video0'.
Additional debug info:
v4l2_calls.c(493): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
system error: No such file or directory
Setting pipeline to NULL ...
Freeing pipeline ...
imnotanerd@sys76laptop:~$

[jakobcreutzfeldt]

Ok, try

sudo modprobe uvcvideo

and then try the previous commands again. uvcvideo is the kernel module that the webcam depends on.

[imnotanerd]

imnotanerd@sys76laptop:~$ sudo modprobe uvcvideo
[sudo] password for imnotanerd: 
imnotanerd@sys76laptop:~$ dmesg | grep BisonCam
imnotanerd@sys76laptop:~$ dmesg | grep uvcvideo
[  207.628090] usbcore: registered new interface driver uvcvideo
imnotanerd@sys76laptop:~$ gst-launch-0.10 v4l2src ! xvimagesink
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Cannot identify device '/dev/video0'.
Additional debug info:
v4l2_calls.c(493): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
system error: No such file or directory
Setting pipeline to NULL ...
Freeing pipeline ...
imnotanerd@sys76laptop:~$