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authorTakashi Iwai <tiwai@suse.de>2006-01-12 18:28:44 +0100
committerJaroslav Kysela <perex@suse.cz>2006-03-22 10:22:51 +0100
commit27346166a9b3b9eee586bce212502cddf9685a07 (patch)
tree97a1feb7937b0ca82538e049e7e332f4797b2eb9 /Documentation
parent84a43bd523a63f1b53fd734c3798d71b7b53f123 (diff)
downloadlwn-27346166a9b3b9eee586bce212502cddf9685a07.tar.gz
lwn-27346166a9b3b9eee586bce212502cddf9685a07.zip
[ALSA] hda-intel - Add single_cmd option for debugging
Modules: Documentation,HDA Intel driver Added single_cmd module option for debugging in the case CORB/RIRB doesn't work well (e.g. due to wrong irq routings). Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 36b511c7cade..cc8a70187199 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -671,6 +671,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
model - force the model name
position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
+ single_cmd - Use single immediate commands to communicate with
+ codecs (for debugging only)
This module supports one card and autoprobe.
@@ -723,6 +725,17 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
(Usually SD_LPLIB register is more accurate than the
position buffer.)
+ NB: If you get many "azx_get_response timeout" messages at
+ loading, it's likely a problem of interrupts (e.g. ACPI irq
+ routing). Try to boot with options like "pci=noacpi". Also, you
+ can try "single_cmd=1" module option. This will switch the
+ communication method between HDA controller and codecs to the
+ single immediate commands instead of CORB/RIRB. Basically, the
+ single command mode is provided only for BIOS, and you won't get
+ unsolicited events, too. But, at least, this works independently
+ from the irq. Remember this is a last resort, and should be
+ avoided as much as possible...
+
The power-management is supported.
Module snd-hdsp