Webcam (v4l2 source) available to remote session

Thiago Macieira thiago at
Thu Mar 18 08:08:30 PDT 2010

Em Quinta-feira 18 Março 2010, às 16:00:31, Stuart Doherty escreveu:
> I should have been clearer on this.  Everything works fine when I'm sitting
> at my desktop, logged into the local machine.  In my case I'm use the
> gstreamer framework to make use of my webcam (v4l is running fine).  If I
> do:
> $ls -al /dev/video0
> I see that the file is there.  I log out, and drive 10 minutes to work,
> then log into my machine remotely and try to list /dev/video0 and it
> doesn't exist.  There is some system that is making the device available
> to local sessions only (or I'm missing something?).  My research led me to
> dbus/udev/etc. because these are frameworks/layers for abstracting
> hardware, providing hotplug, etc. etc.  This sounded like a hotplug type
> thing to me. It would make sense to me that Ubuntu might set this system
> up to only allow local webcam use (so people can't spy on people), but I
> need to get around this (not for spying though ;) ).

Hi Stuart

The answer is still the same: if the device file doesn't exist, the kernel 
module isn't loaded or the hardware isn't there.

If it's the same machine and you didn't unplug any USB cables or docking 
station or anything, the hardware is the same.

So the kernel module must have been unloaded.

Anyway, it's not a D-Bus issue. We can't help you more in this mailing list.
Thiago Macieira - thiago (AT) - thiago (AT)
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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