Opa, o problema é o seguinte: eu uso o Guitarix com o QJackCtl. Só que acontece umas falhas de audio. Estou tranquilamente tocando, e, derrepente, o QJack trava. Volta depois de alguns segundos, mas de tempos em tempos (da ordem de minutos) volta a dar essas travadinhas. É algo meio aleatório. As vezes começa a travar muito e simplesmente não tem como tocar nada.
Na caixa de mensagens do Jack é isso que aparece:
18:08:57.656 XRUN callback (2 skipped).
18:08:59.666 XRUN callback (174 skipped).
18:09:01.677 XRUN callback (108 skipped).
18:09:01.973 XRUN callback (28804).
18:09:03.686 XRUN callback (174 skipped).
18:09:05.696 XRUN callback (201 skipped).
18:09:07.706 XRUN callback (201 skipped).
18:09:09.715 XRUN callback (124 skipped).
18:09:09.992 XRUN callback (29508).
18:09:11.725 XRUN callback (177 skipped).
18:09:13.735 XRUN callback (208 skipped).
18:09:15.746 XRUN callback (205 skipped).
18:09:17.755 XRUN callback (200 skipped).
18:09:19.765 XRUN callback (143 skipped).
18:09:20.801 XRUN callback (30446).
18:09:21.774 XRUN callback (2 skipped).
18:09:23.783 XRUN callback (203 skipped).
18:09:25.794 XRUN callback (154 skipped).
18:09:26.816 XRUN callback (30808).
18:09:27.803 XRUN callback (102 skipped).
18:09:29.813 XRUN callback (120 skipped).
18:09:31.824 XRUN callback (166 skipped).
18:09:32.834 XRUN callback (31199).
18:09:34.842 XRUN callback (31200).
18:09:36.847 XRUN callback (31201).
18:09:37.860 XRUN callback (100 skipped).
18:09:39.871 XRUN callback (205 skipped).
18:09:41.882 XRUN callback (204 skipped).
18:09:43.893 XRUN callback (203 skipped).
18:09:45.904 XRUN callback (195 skipped).
18:09:47.676 XRUN callback (32113).
18:09:47.914 XRUN callback (25 skipped).
18:09:49.923 XRUN callback (199 skipped).
18:09:51.684 XRUN callback (32339).
18:09:51.933 XRUN callback (26 skipped).
18:09:53.945 XRUN callback (200 skipped).
18:09:55.956 XRUN callback (204 skipped).
18:09:57.965 XRUN callback (203 skipped).
18:09:59.975 XRUN callback (204 skipped).
18:10:01.987 XRUN callback (203 skipped).
18:10:03.997 XRUN callback (151 skipped).
18:10:06.007 XRUN callback (203 skipped).
18:10:08.017 XRUN callback (203 skipped).
18:10:10.027 XRUN callback (204 skipped).
18:10:12.036 XRUN callback (203 skipped).
18:10:14.046 XRUN callback (205 skipped).
18:10:15.664 XRUN callback (34603).
18:10:16.063 XRUN callback (77 skipped).
Sat Jan 28 18:10:15 2017: ERROR: JackEngine::XRun: client = gx_head_amp was not finished, state = Running
Sat Jan 28 18:10:15 2017: ERROR: JackEngine::XRun: client = gx_head_fx was not finished, state = Triggered
Sat Jan 28 18:10:15 2017: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Sat Jan 28 18:10:15 2017: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
18:10:18.078 XRUN callback (202 skipped).
18:10:20.089 XRUN callback (204 skipped).
18:10:22.100 XRUN callback (204 skipped).
18:10:24.110 XRUN callback (203 skipped).
Obs: Uso Ubuntu 16.04 LTS.