Public bug reported:

I have installed libcec4 and cec-utils on a RPi running Ubuntu 20.04
32-bit and cannot detect the RPi cec device. RPi is not included in the
features show when running cec-client. This package does list RPi as a
supported device.

Packages installed:
ii  cec-utils                      4.0.4+dfsg1-4ubuntu3                      
armhf        USB CEC Adaptor communication Library (utility programs)
ii  libcec4:armhf                  4.0.4+dfsg1-4ubuntu3                      
armhf        USB CEC Adaptor communication Library (shared library)

Output from cec-client -l
libCEC version: 4.0.4, compiled on Linux-4.4.0-176-generic ... , features: 
P8_USB, DRM, P8_detect, randr, Exynos, AOCEC
Found devices: NONE

output from cec-client -l on Raspbian (Debian 9)
cec-client -l
libCEC version: 4.0.4, compiled on Linux-4.15.0-48-generic ... , features: 
P8_USB, DRM, P8_detect, randr, RPi, Exynos, AOCEC
Found devices: 1

device:              1
com port:            RPI
vendor id:           2708
product id:          1001
firmware version:    1
type:                Raspberry Pi


If you need any additional information please let me know.
Thank you,
Nathan

** Affects: libcec (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1880077

Title:
  Unable to find RPi device on RPi 3B+ with libcec4

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