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[ALSA] Add description about probe_mask option for snd-hda-intel
Added a brief description about probe_mask option for snd-hda-intel. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
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@ -759,6 +759,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
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model - force the model name
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position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
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probe_mask - Bitmask to probe codecs (default = -1, meaning all slots)
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single_cmd - Use single immediate commands to communicate with
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codecs (for debugging only)
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enable_msi - Enable Message Signaled Interrupt (MSI) (default = off)
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@ -966,6 +967,17 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
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from the irq. Remember this is a last resort, and should be
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avoided as much as possible...
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MORE NOTES ON "azx_get_response timeout" PROBLEMS:
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On some hardwares, you may need to add a proper probe_mask option
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to avoid the "azx_get_response timeout" problem above, instead.
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This occurs when the access to non-existing or non-working codec slot
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(likely a modem one) causes a stall of the communication via HD-audio
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bus. You can see which codec slots are probed by enabling
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CONFIG_SND_DEBUG_DETECT, or simply from the file name of the codec
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proc files. Then limit the slots to probe by probe_mask option.
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For example, probe_mask=1 means to probe only the first slot, and
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probe_mask=4 means only the third slot.
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The power-management is supported.
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Module snd-hdsp
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