Hang using UPC

[E. Recio]

So I am trying to scan a CD barcode (using my USB serial port scanner - 
basically a keyboard emulator that pastes the numbers as if typing in 
when it scans the barcode). I go back and just plain old trying to type 
in the CD barcode in the UPC/EAN lookup lineedit. In any case, a small 
window opens up and just hangs there my Tellico session. I have to force 
quit, losing work.

I have enabled a bunch of QT/KDE debug settings and have traced it down 
to the following errors (see below) right before the application hangs. 
I have v4l2 installed (libv4l2-0-1.30.1-160000.2.2.x86_64).

Upon reading the compile instructions when I saw that if you want to 
scan barcodes using a webcam, you must enable/have v4l2. Seems like this 
was compiled in by my vendor (OpenSuSE 16.0) and I don't need it have it 
activated. How do I (on command line/env var) disable this v4l2 feature 
when using UPC? Is there a setting in Tellico configuration that I can 
disable webcam completely.

[05:11:59] [ unknown:0  unknown ] 
"/usr/lib64/qt6/plugins/kf6/kio/kio_file.so" loaded library
[05:11:59] IFFChunk::innerFromDevice: unkwnown chunk "\x89PNG"
[05:11:59] [ unknown:0  unknown ] checking directory path 
"/usr/lib64/qt6/plugins/kiconthemes6/accessiblebridge" ...
[05:11:59] [ unknown:0  unknown ] checking directory path 
"/usr/lib64/qt6/plugins/accessiblebridge" ...
[05:11:59] [ unknown:0  unknown ] checking directory path 
"/usr/bin/accessiblebridge" ...
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83
libv4l2: error v4l2_set_control called with invalid fd: 83