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all of a sudden cheese does not work. Webcam does not work (never tried it until now)

Gucview works

running cheese in root mode works gksu cheese

skype seems to work but not tested realtime

Possible cause.. I remember following instructions here for a bug to get a program to work or apt to install something it was refusing to install (not sure how to find it or what that program that did not work was). But it said to delete something and then to reinstall skype and another thing. This other thing was not installed so I did not reinstall or install it. I am quite vague on this sorry. But maybe the person here remembers and I can find the link and install that software.

Here is the output from entering cheese in term

~$ cheese
** Message: cheese-application.vala:211: Error during camera setup: No device found


(cheese:8126): cheese-CRITICAL **: cheese_camera_device_get_name: assertion 'CHEESE_IS_CAMERA_DEVICE (device)' failed

(cheese:8126): GLib-CRITICAL **: g_variant_new_string: assertion 'string != NULL' failed

(cheese:8126): GLib-GIO-CRITICAL **: g_settings_schema_key_type_check: assertion 'value != NULL' failed

(cheese:8126): GLib-CRITICAL **: g_variant_get_type_string: assertion 'value != NULL' failed

(cheese:8126): GLib-GIO-CRITICAL **: g_settings_set_value: key 'camera' in 'org.gnome.Cheese' expects type 's', but a GVariant of type '(null)' was given

** (cheese:8126): CRITICAL **: cheese_preferences_dialog_setup_resolutions_for_device: assertion 'device != NULL' failed

Here is the output if I gksu cheese (REMEMBER, THIS WORKS THOUGH)

:~$ gksu cheese
Gtk-Message: Failed to load module "pantheon-filechooser-module"

and here is the output from entering guvcview in term

~$ guvcview
GUVCVIEW: version 2.0.2
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)
attempt to connect to server failed

(guvcview:8185): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -43 and height 17

(guvcview:8185): Gtk-CRITICAL **: gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed
  • It's definitely a permissions issue. Before systemd, you needed to be part of the video group to access the webcam. You might try adding yourself with sudo usermod -a -G video $USER (you'll need to logout and back in). However I am sceptical that this will work as this seems to be controlled with uaccess tags by udev (of which I know knowing). Also check that your webcam has the right permissions - can you post the output of ls -l /dev/video0 (assuming you only have one webcame plugged in)? – Mike Wild Jan 31 '17 at 11:16
  • I have already installed the gnome-system-tools to change/see users and groups. I am a member of video The output is as follows crw-rw-rw-+ 1 root video 81, 0 Jan 31 19:06 /dev/video0 – Bhikkhu Subhuti Jan 31 '17 at 12:52
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    Could you put that in your original question rather than a comment, it will improve the readability? – Mike Wild Jan 31 '17 at 13:20
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    Thanks for that - it'll help other people too. Unfortunately I'm not sure what the issue is. For those trying to help, it's getting stuck in this method in Cheese. – Mike Wild Jan 31 '17 at 13:56
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    I'm not able to install Jack unfortunately. I'd like to say it's unrelated, although possibly it might be something to do with the built-in mic (I thought this appeared as a separate device however). Is there a particular reason you have Jack installed? – Mike Wild Jan 31 '17 at 14:29
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Cheese and "camera" seems to work all of a sudden. I would suspect it was from a linux kernel update or Elementary that I think happened. If this happens to you, either run it as sudo or wait until another update comes.

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