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ALSA: hda - Update documentation
Update documentation regarding codec probing; the new probe_only option and the new probe_mask usage. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -757,6 +757,9 @@ 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 = use LPIB, 2 = POSBUF)
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probe_mask - Bitmask to probe codecs (default = -1, meaning all slots)
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When the bit 8 (0x100) is set, the lower 8 bits are used
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as the "fixed" codec slots; i.e. the driver probes the
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slots regardless what hardware reports back
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probe_only - Only probing and no codec initialization (default=off);
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Useful to check the initial codec status for debugging
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bdl_pos_adj - Specifies the DMA IRQ timing delay in samples.
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@ -109,6 +109,13 @@ slot, pass `probe_mask=1`. For the first and the third slots, pass
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Since 2.6.29 kernel, the driver has a more robust probing method, so
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this error might happen rarely, though.
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On a machine with a broken BIOS, sometimes you need to force the
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driver to probe the codec slots the hardware doesn't report for use.
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In such a case, turn the bit 8 (0x100) of `probe_mask` option on.
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Then the rest 8 bits are passed as the codec slots to probe
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unconditionally. For example, `probe_mask=0x103` will force to probe
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the codec slots 0 and 1 no matter what the hardware reports.
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Interrupt Handling
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~~~~~~~~~~~~~~~~~~
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@ -461,6 +468,16 @@ run with `--no-upload` option, and attach the generated file.
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There are some other useful options. See `--help` option output for
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details.
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When a probe error occurs or when the driver obviously assigns a
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mismatched model, it'd be helpful to load the driver with
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`probe_only=1` option (at best after the cold reboot) and run
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alsa-info at this state. With this option, the driver won't configure
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the mixer and PCM but just tries to probe the codec slot. After
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probing, the proc file is available, so you can get the raw codec
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information before modified by the driver. Of course, the driver
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isn't usable with `probe_only=1`. But you can continue the
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configuration via hwdep sysfs file if hda-reconfig option is enabled.
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hda-verb
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~~~~~~~~
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