[pulseaudio-tickets] [Bug 84585] Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84585

--- Comment #66 from Raymond <superquad.vortex2 at gmail.com> ---
if you think the bug is related to kernel

you need to check whether hwptr is correct on period update 

and report bug at

https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers

CONFIG_SND_PCM_XRUN_DEBUG, CONFIG_SND_VERBOSE_PROCFS, CONFIG_SND_DEBUG options
must be enabled in your kernel

www.alsa-project.org/main/index.php/XRUN_Debug

 # Enable basic debugging and dump stack, check hardware pointer on the period
update
 # Usefull to just see, if PCM stream is stopped for a reason (usually wrong
audio process timing from scheduler)
 # And to check the values from driver
 echo 11 > /proc/asound/card0/pcm0p/xrun_debug

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