If a card has been hot-plugged after pulseaudio start, alsa-lib still has old configuration in memory, which doesn't have PCM definitions for the new card. Thus, this error appears, and the device doesn't work: I: [pulseaudio] (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.front.0:CARD=0' I: [pulseaudio] (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: [pulseaudio] (alsa-lib)conf.c: Evaluate error: No such file or directory I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM front:0 I: [pulseaudio] alsa-util.c: Error opening PCM device front:0: No such file or directory The snd_config_update_free_global() function makes alsa-lib forget any cached configuration and reparse all PCM definitions from scratch next time it is told to open anything. The trick has been copied from Phonon. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=54029 Signed-off-by: Alexander E. Patrakov <patrakov at gmail.com> --- src/modules/alsa/alsa-sink.c | 9 +++++++++ src/modules/alsa/alsa-source.c | 9 +++++++++ src/modules/alsa/module-alsa-card.c | 8 ++++++++ 3 files changed, 26 insertions(+) diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c index 2fdebe0..63674e2 100644 --- a/src/modules/alsa/alsa-sink.c +++ b/src/modules/alsa/alsa-sink.c @@ -2146,6 +2146,15 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca b = use_mmap; d = use_tsched; + /* Force ALSA to reread its configuration if module-alsa-card didn't + * do it for us. This matters if our device was hot-plugged after ALSA + * has already read its configuration - see + * https://bugs.freedesktop.org/show_bug.cgi?id=54029 + */ + + if (!card) + snd_config_update_free_global(); + if (mapping) { if (!(dev_id = pa_modargs_get_value(ma, "device_id", NULL))) { diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c index 4683dfe..0820b48 100644 --- a/src/modules/alsa/alsa-source.c +++ b/src/modules/alsa/alsa-source.c @@ -1854,6 +1854,15 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p b = use_mmap; d = use_tsched; + /* Force ALSA to reread its configuration if module-alsa-card didn't + * do it for us. This matters if our device was hot-plugged after ALSA + * has already read its configuration - see + * https://bugs.freedesktop.org/show_bug.cgi?id=54029 + */ + + if (!card) + snd_config_update_free_global(); + if (mapping) { if (!(dev_id = pa_modargs_get_value(ma, "device_id", NULL))) { diff --git a/src/modules/alsa/module-alsa-card.c b/src/modules/alsa/module-alsa-card.c index e5cc4ae..adb942b 100644 --- a/src/modules/alsa/module-alsa-card.c +++ b/src/modules/alsa/module-alsa-card.c @@ -715,6 +715,14 @@ int pa__init(pa_module *m) { } pa_modargs_get_value_boolean(u->modargs, "use_ucm", &u->use_ucm); + + /* Force ALSA to reread its configuration. This matters if our device + * was hot-plugged after ALSA has already read its configuration - see + * https://bugs.freedesktop.org/show_bug.cgi?id=54029 + */ + + snd_config_update_free_global(); + if (u->use_ucm && !pa_alsa_ucm_query_profiles(&u->ucm, u->alsa_card_index)) { pa_log_info("Found UCM profiles"); -- 2.8.2
