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-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt16
1 files changed, 9 insertions, 7 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 221b81016db..b9cfd339a6f 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -860,8 +860,14 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
[Multiple options for each card instance]
model - force the model name
- position_fix - Fix DMA pointer (0 = auto, 1 = use LPIB, 2 = POSBUF,
- 3 = VIACOMBO, 4 = COMBO)
+ position_fix - Fix DMA pointer
+ -1 = system default: choose appropriate one per controller
+ hardware
+ 0 = auto: falls back to LPIB when POSBUF doesn't work
+ 1 = use LPIB
+ 2 = POSBUF: use position buffer
+ 3 = VIACOMBO: VIA-specific workaround for capture
+ 4 = COMBO: use LPIB for playback, auto for capture stream
probe_mask - Bitmask to probe codecs (default = -1, meaning all slots)
When the bit 8 (0x100) is set, the lower 8 bits are used
as the "fixed" codec slots; i.e. the driver probes the
@@ -875,8 +881,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
setup before initializing the codecs. This option is
available only when CONFIG_SND_HDA_PATCH_LOADER=y is set.
See HD-Audio.txt for details.
- beep_mode - Selects the beep registration mode (0=off, 1=on, 2=
- dynamic registration via mute switch on/off); the default
+ beep_mode - Selects the beep registration mode (0=off, 1=on); default
value is set via CONFIG_SND_HDA_INPUT_BEEP_MODE kconfig.
[Single (global) options]
@@ -1900,7 +1905,6 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
vid - Vendor ID for the device (optional)
pid - Product ID for the device (optional)
nrpacks - Max. number of packets per URB (default: 8)
- async_unlink - Use async unlink mode (default: yes)
device_setup - Device specific magic number (optional)
- Influence depends on the device
- Default: 0x0000
@@ -1912,8 +1916,6 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
NB: nrpacks parameter can be modified dynamically via sysfs.
Don't put the value over 20. Changing via sysfs has no sanity
check.
- NB: async_unlink=0 would cause Oops. It remains just for
- debugging purpose (if any).
NB: ignore_ctl_error=1 may help when you get an error at accessing
the mixer element such as URB error -22. This happens on some
buggy USB device or the controller.