1 # ALSA soundcard-configuration
15 # To be effective this also requires INPUT - users should say:
16 # select SND_JACK if INPUT=y || INPUT=SND
17 # to avoid having to force INPUT on.
22 tristate "Sequencer support"
25 Say Y or M to enable MIDI sequencer and router support. This
26 feature allows routing and enqueueing of MIDI events. Events
27 can be processed at a given time.
29 Many programs require this feature, so you should enable it
30 unless you know what you're doing.
33 tristate "Sequencer dummy client"
34 depends on SND_SEQUENCER
36 Say Y here to enable the dummy sequencer client. This client
37 is a simple MIDI-through client: all normal input events are
38 redirected to the output port immediately.
40 You don't need this unless you want to connect many MIDI
41 devices or applications together.
43 To compile this driver as a module, choose M here: the module
44 will be called snd-seq-dummy.
50 tristate "OSS Mixer API"
53 To enable OSS mixer API emulation (/dev/mixer*), say Y here
54 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
56 Many programs still use the OSS API, so say Y.
58 To compile this driver as a module, choose M here: the module
59 will be called snd-mixer-oss.
62 tristate "OSS PCM (digital audio) API"
66 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
67 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
69 Many programs still use the OSS API, so say Y.
71 To compile this driver as a module, choose M here: the module
72 will be called snd-pcm-oss.
74 config SND_PCM_OSS_PLUGINS
75 bool "OSS PCM (digital audio) API - Include plugin system"
76 depends on SND_PCM_OSS
79 If you disable this option, the ALSA's OSS PCM API will not
80 support conversion of channels, formats and rates. It will
81 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
83 config SND_SEQUENCER_OSS
84 bool "OSS Sequencer API"
85 depends on SND_SEQUENCER
88 Say Y here to enable OSS sequencer emulation (both
89 /dev/sequencer and /dev/music interfaces).
91 Many programs still use the OSS API, so say Y.
93 If you choose M in "Sequencer support" (SND_SEQUENCER),
94 this will be compiled as a module. The module will be called
98 tristate "RTC Timer support"
102 Say Y here to enable RTC timer support for ALSA. ALSA uses
103 the RTC timer as a precise timing source and maps the RTC
104 timer to ALSA's timer interface. The ALSA sequencer code also
105 can use this timing source.
107 To compile this driver as a module, choose M here: the module
108 will be called snd-rtctimer.
110 config SND_SEQ_RTCTIMER_DEFAULT
111 bool "Use RTC as default sequencer timer"
112 depends on SND_RTCTIMER && SND_SEQUENCER
115 Say Y here to use the RTC timer as the default sequencer
116 timer. This is strongly recommended because it ensures
117 precise MIDI timing even when the system timer runs at less
122 config SND_DYNAMIC_MINORS
123 bool "Dynamic device file minor numbers"
125 If you say Y here, the minor numbers of ALSA device files in
126 /dev/snd/ are allocated dynamically. This allows you to have
127 more than 8 sound cards, but requires a dynamic device file
130 If you are unsure about this, say N here.
132 config SND_SUPPORT_OLD_API
133 bool "Support old ALSA API"
136 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
139 config SND_VERBOSE_PROCFS
140 bool "Verbose procfs contents"
144 Say Y here to include code for verbose procfs contents (provides
145 useful information to developers when a problem occurs). On the
146 other side, it makes the ALSA subsystem larger.
148 config SND_VERBOSE_PRINTK
149 bool "Verbose printk"
151 Say Y here to enable verbose log messages. These messages
152 will help to identify source file and position containing
155 You don't need this unless you're debugging ALSA.
160 Say Y here to enable ALSA debug code.
162 config SND_DEBUG_VERBOSE
163 bool "More verbose debug"
166 Say Y here to enable extra-verbose debugging messages.
168 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
169 So, say Y only if you are ready to be annoyed.
171 config SND_PCM_XRUN_DEBUG
172 bool "Enable PCM ring buffer overrun/underrun debugging"
174 depends on SND_DEBUG && SND_VERBOSE_PROCFS
176 Say Y to enable the PCM ring buffer overrun/underrun debugging.
177 It is usually not required, but if you have trouble with
178 sound clicking when system is loaded, it may help to determine
179 the process or driver which causes the scheduling gaps.