Lenovo x240 webcam not working with cheese/pwcview

[Sean Bruno]

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Unsure how to debug what's up here.  webcamd seems to attach correctly
and doesn't output any errors, but cheese is unable to access the webcam
in /dev/video0

% ls -l /dev/video0
crw-rw----  1 webcamd  webcamd  0x6c Jan 12 07:54 /dev/video0
% groups sbruno
sbruno wheel operator webcamd vboxusers

pwcview seems to abort when attaching to my X11 session:

% pwcview
Webcam set to: 320x240 (sif) at 5 fps
XDM authorization key matches an existing client!Failed to init sdl:
Couldn't open X11 display
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