[alsa-devel] Duplicate wake-ups in pcm_lib.c

[Jaroslav Kysela]

On Mon, 11 Jan 2010, Raymond Yau wrote:

> 2010/1/7 Jaroslav Kysela <perex at perex.cz>
>
>> On Wed, 6 Jan 2010, pl bossart wrote:
>>
>>
>>
>> The improved and more clean fix in now in my tree:
>>
>>
>> http://git.alsa-project.org/?p=alsa-kernel.git;a=commitdiff;h=1250932e48d3b698415b1f04775433cf1da688d6
>>
>> Note that you should apply these 4 patches (in reverse order):
>>
>> 4: ALSA: pcm_lib - optimize wake_up() calls for PCM I/O
>> 3: ALSA: pcm_lib - cleanup & merge hw_ptr update functions
>> 2: ALSA: pcm_lib - add possibility to log last 10 DMA ring buffer positions
>> 1: ALSA: pcm_lib.c - convert second xrun_debug() parameter to use defines
>>
>> Patch #3 should definitely fix problems with large avail or delay values
>> reported in PA. I finally figured the culprit (and decide to cleanup all
>> relevant code rather do just another workaround). In other words, new
>> hw_ptr pointer should never be less than previous one now.
>>
>>                                                Jaroslav
>>
>> -
>>
>
> using alsa-driver-1.0.22.1.1.g231e3.14.g812cb and Fedora 12 inside Virtual
> Box
>
> aplay -D plughw:0,0 /usr/share/sounds/alsa/*.wav
>
> "Front Left" sound as "Front Front Left" when playing "Front_left.wav"
>
> only when echo 4 > /proc/asound/card0/pcm0p/xrun_debug

Thanks for testing.

It means that with other values is no sound generated?

Could you use value 29 for xrun_debug and report all sound related 
messages from dmesg output after playback of "Front_left.wav"?

 					Jaroslav

-----
Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.