Shared Library Changes for Release 2.2.2

Shared library libddcutil is backwardly compatible with the ones in ddcutil 2.2.1 and 2.2.0. The SONAME is unchanged as libddcutil.so.5. The released library file is libddcutil.so.5.4.0.

Watch mode udev

Use libudev to watch for display connection and disconnection. This is now the default watch mode if ddcutil was built to use libudev, which is normally the case (configure option --enable-udev). A specific watch mode can be forced using --watch-mode udev, --watch-mode xevent, or --watch-mode poll. Addresses issues raised in KDE-Plasma PowerDevil merge request 542.

Note there is presently no API function for selecting watch-mode. A client program can specify a watch-mode other than UDEV by including a --watch-mode option in the libopts parameter string passed to ddca_init2().

Fixed

• ddca_set_non_table_vcp_value() was not performing verification,
• ddca_display_ref_from_handle(): was not converting internal to external display reference, causing a segfault. Issue #528.