Webcam (v4l2 source) available to remote session

Stuart Doherty stu.doherty at
Fri Mar 19 04:18:53 PDT 2010

Okay, thanks for humouring me anyway.  I'll throw this reply back in case
someone else makes my mistake in the future.

My webcam is built in to my monitor, and my system is set to suspend the
monitor after 10 minutes of inactivity, which also happens to turn off the
webcam.  It takes me 10 minutes to drive to work, so thats why the device
was disappearing.

Sorry for the junkmail.


On Thu, Mar 18, 2010 at 11:08 AM, Thiago Macieira <thiago at> wrote:

> 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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