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authorTakashi Iwai <tiwai@suse.de>2011-09-28 20:12:08 +0200
committerTakashi Iwai <tiwai@suse.de>2011-09-28 20:19:16 +0200
commitef940b0403d4ae133c548b01fe64c74fa8a2f0b1 (patch)
treeba205acaabbabe84f5f00a081443a163b7bec878 /Documentation/sound
parent27fe48d97291e61e76e87c34c9b89032e70d05c0 (diff)
ALSA: hda - Allow patching with any vendor/subsystem ids
In the ugly real world, there area really broken devices that don't set codec SSID correctly. In such a case, the ID can be random, thus the patching won't work reliably. For applying the patch forcibly to such a device, the driver will skip the vendor and/or subsystem ID checks when zero or a negative number is given in [codec] section. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/HD-Audio.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index 850b1b3956a..caa3ec655ea 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -447,7 +447,10 @@ The file needs to have a line `[codec]`. The next line should contain
three numbers indicating the codec vendor-id (0x12345678 in the
example), the codec subsystem-id (0xabcd1234) and the address (2) of
the codec. The rest patch entries are applied to this specified codec
-until another codec entry is given.
+until another codec entry is given. Passing 0 or a negative number to
+the first or the second value will make the check of the corresponding
+field be skipped. It'll be useful for really broken devices that don't
+initialize SSID properly.
The `[model]` line allows to change the model name of the each codec.
In the example above, it will be changed to model=auto.