I guess you need to call set_rlimits to get realtime scheduling privileges and thus allows you to run jackd in realtime mode (-R). What exact server path are you specifying in the qjackctl setup/settings/server? It seems you have a blank before set_rlimits prefix. Take also note that set_rlimits must not be a shell script, qjackctl expects to run the server path as a plain executable binary. OTOH, you should specify the complete absolute path unless found on the current search PATH. If you still fail to make it through, try the other way around, start `set_rlimits qjackctl`instead and leave jackd as the plain server path.
I guess you need to call set_rlimits to get realtime scheduling privileges and thus allows you to run jackd in realtime mode (-R). What exact server path are you specifying in the qjackctl setup/settings/server? It seems you have a blank before set_rlimits prefix. Take also note that set_rlimits must not be a shell script, qjackctl expects to run the server path as a plain executable binary. OTOH, you should specify the complete absolute path unless found on the current search PATH. If you still fail to make it through, try the other way around, start `set_rlimits qjackctl`instead and leave jackd as the plain server path.
HTH