Comment # 4 on bug 1132458 from Dave Plater

Thanks I used that patch.
Patched jack works:
 jack_control 
Usage: jack_control [command] [command] ...
Commands:
    exit                       - exit jack dbus service (stops jack server if
currently running)
    help                       - print this help text
    status                     - check whether jack server is started, return
value is 0 if running and 1 otherwise
    start                      - start jack server if not currently started
    stop                       - stop jack server if currently started
    sm                         - switch master to currently selected driver
    dl                         - get list of available drivers
    dg                         - get currently selected driver
    ds <driver>                - select driver
    dp                         - get parameters of currently selected driver
    dpd <param>                - get long description for driver parameter
    dps <param> <value>        - set driver parameter
    dpr <param>                - reset driver parameter to its default value
    asd <driver>               - add slave driver
    rsd <driver>               - remove slave driver
    il                         - get list of available internals
    ip <name>                  - get parameters of given internal
    ipd <name> <param>         - get long description for internal parameter
    ips <name> <param> <value> - set internal parameter
    ipr <name> <param>         - reset internal parameter to its default value
    iload <name>               - load internal
    iunload <name>             - unload internal
    ep                         - get engine parameters
    epd <param>                - get long description for engine parameter
    eps <param> <value>        - set engine parameter
    epr <param>                - reset engine parameter to its default value
On the way to Factory via sr#694428
Will prepare an update for 15.0
If necessary a working jack can be installed from:
https://download.opensuse.org/repositories/home:/plater/Leap_15.0 It should be
version and release jack-1.9.12-lp150.108.1
or
https://download.opensuse.org/repositories/home:/plater/Tumbleweed same version
and release as above. It hasn't published at the time of writing.