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-rw-r--r--Documentation/sound/alsa/HD-Audio.txt47
1 files changed, 44 insertions, 3 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index 8d68fff7183..c5948f2f9a2 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -109,6 +109,13 @@ slot, pass `probe_mask=1`. For the first and the third slots, pass
Since 2.6.29 kernel, the driver has a more robust probing method, so
this error might happen rarely, though.
+On a machine with a broken BIOS, sometimes you need to force the
+driver to probe the codec slots the hardware doesn't report for use.
+In such a case, turn the bit 8 (0x100) of `probe_mask` option on.
+Then the rest 8 bits are passed as the codec slots to probe
+unconditionally. For example, `probe_mask=0x103` will force to probe
+the codec slots 0 and 1 no matter what the hardware reports.
+
Interrupt Handling
~~~~~~~~~~~~~~~~~~
@@ -358,10 +365,26 @@ modelname::
to this file.
init_verbs::
The extra verbs to execute at initialization. You can add a verb by
- writing to this file. Pass tree numbers, nid, verb and parameter.
+ writing to this file. Pass three numbers: nid, verb and parameter
+ (separated with a space).
hints::
- Shows hint strings for codec parsers for any use. Right now it's
- not used.
+ Shows / stores hint strings for codec parsers for any use.
+ Its format is `key = value`. For example, passing `hp_detect = yes`
+ to IDT/STAC codec parser will result in the disablement of the
+ headphone detection.
+init_pin_configs::
+ Shows the initial pin default config values set by BIOS.
+driver_pin_configs::
+ Shows the pin default values set by the codec parser explicitly.
+ This doesn't show all pin values but only the changed values by
+ the parser. That is, if the parser doesn't change the pin default
+ config values by itself, this will contain nothing.
+user_pin_configs::
+ Shows the pin default config values to override the BIOS setup.
+ Writing this (with two numbers, NID and value) appends the new
+ value. The given will be used instead of the initial BIOS value at
+ the next reconfiguration time. Note that this config will override
+ even the driver pin configs, too.
reconfig::
Triggers the codec re-configuration. When any value is written to
this file, the driver re-initialize and parses the codec tree
@@ -371,6 +394,14 @@ clear::
Resets the codec, removes the mixer elements and PCM stuff of the
specified codec, and clear all init verbs and hints.
+For example, when you want to change the pin default configuration
+value of the pin widget 0x14 to 0x9993013f, and let the driver
+re-configure based on that state, run like below:
+------------------------------------------------------------------------
+ # echo 0x14 0x9993013f > /sys/class/sound/hwC0D0/user_pin_configs
+ # echo 1 > /sys/class/sound/hwC0D0/reconfig
+------------------------------------------------------------------------
+
Power-Saving
~~~~~~~~~~~~
@@ -461,6 +492,16 @@ run with `--no-upload` option, and attach the generated file.
There are some other useful options. See `--help` option output for
details.
+When a probe error occurs or when the driver obviously assigns a
+mismatched model, it'd be helpful to load the driver with
+`probe_only=1` option (at best after the cold reboot) and run
+alsa-info at this state. With this option, the driver won't configure
+the mixer and PCM but just tries to probe the codec slot. After
+probing, the proc file is available, so you can get the raw codec
+information before modified by the driver. Of course, the driver
+isn't usable with `probe_only=1`. But you can continue the
+configuration via hwdep sysfs file if hda-reconfig option is enabled.
+
hda-verb
~~~~~~~~