Seeing this message usually means the HDMI handshake is working, but the device is using its "fallback" hardware name.

\[ M(\mboxmeson ref.~\reftable:pdg) = 1869.5 \text MeV \]

// New Feature Function int mbox_process_feature(const char *input);

Let me know how I can assist further!

A test suite for an MBOX parser could store expected results as .ref files (reference outputs), checked on each build with Meson:

Vizio TV HDMI2 Not Showing? Expert Troubleshooting Guide - JustAnswer