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

[Raymond Yau]

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