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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84585#c84">Comment # 84</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84585">bug 84585</a>
from <span class="vcard"><a class="email" href="mailto:superquad.vortex2@gmail.com" title="Raymond <superquad.vortex2@gmail.com>"> <span class="fn">Raymond</span></a>
</span></b>
<pre> 1.132| 0.000) D: [pulseaudio] alsa-util.c: Hardware PCM card 0
'snd_rpi_hifiberry_amp' device 0 subdevice 0
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: Its setup is:
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: stream : PLAYBACK
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: access :
RW_INTERLEAVED
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: format : S16_LE
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: subformat : STD
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: channels : 2
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: rate : 44100
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: exact rate : 44100
(44100/1)
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: msbits : 16
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: buffer_size : 4408
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: period_size : 1102
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: period_time : 24988
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: tstamp_mode : ENABLE
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: period_step : 1
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: avail_min : 1102
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: period_event : 1
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: start_threshold : -1
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: stop_threshold :
1155530752
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: silence_threshold: 0
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: silence_size : 0
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: boundary : 1155530752
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: appl_ptr : 0
( 1.132| 0.000) D: [pulseaudio] alsa-util.c: hw_ptr : 0
( 1.137| 0.005) D: [pulseaudio] alsa-sink.c: Read hardware volume: 0: 67%
1: 67%
( 1.138| 0.000) D: [alsa-sink] alsa-sink.c: Thread starting up
( 1.138| 0.000) D: [alsa-sink] core-util.c: SCHED_RR|SCHED_RESET_ON_FORK
worked.
( 1.138| 0.000) I: [alsa-sink] core-util.c: Successfully enabled SCHED_RR
scheduling for thread, with priority 5.
( 1.139| 0.000) I: [alsa-sink] alsa-sink.c: Starting playback.
( 1.139| 0.000) I: [alsa-sink] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_START
failed (-77)
you got another error when you change some values of hw_param
you have to ask the author/maintainer of the sound card driver</pre>
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