[alsa-devel] overrun in second capture device after stopping first capture device

[Tobias Schneider]

I am still searching what causes the problem, I now figured out that the 
underruns occur because appl_ptr = hw_ptr - so this is because appl_ptr 
is not moved forward. Are there any reasons for this?

<7>DEBUG: p1 hw_ptr=0x3cdd43 (3988803) appl_ptr=0x3cebbc (3992508) 
jiffie=21775142
<7>DEBUG: p1 hw_ptr=0x3ce028 (3989544) appl_ptr=0x3ceea1 (3993249) 
jiffie=21775165
<7>DEBUG: p1 hw_ptr=0x3ce30d (3990285) appl_ptr=0x3cf186 (3993990) 
jiffie=21775188
<7>DEBUG: p1 hw_ptr=0x3ce5f2 (3991026) appl_ptr=0x3cf46b (3994731) 
jiffie=21775212
<7>DEBUG: p1 hw_ptr=0x3ce8d7 (3991767) appl_ptr=0x3cf750 (3995472) 
jiffie=21775235
<7>DEBUG: p1 hw_ptr=0x3cebbc (3992508) appl_ptr=0x3cf750 (3995472) 
jiffie=21775258
<7>DEBUG: p1 hw_ptr=0x3ceea1 (3993249) appl_ptr=0x3cf750 (3995472) 
jiffie=21775281
<7>DEBUG: p1 hw_ptr=0x3cf186 (3993990) appl_ptr=0x3cf750 (3995472) 
jiffie=21775304
<7>DEBUG: p1 hw_ptr=0x3cf46b (3994731) appl_ptr=0x3cf750 (3995472) 
jiffie=21775328
<7>DEBUG: p1 hw_ptr=0x3cf750 (3995472) appl_ptr=0x3cf750 (3995472) 
jiffie=21775351
<3>ERROR: p1 XRUN B! avail = 4446  stop_threshold = 4446 jiffie_diff=23
<7>DEBUG: playback trigger (1): cmd=stop
<7>DEBUG: trigger stop jiffies=21775351
<7>DEBUG: trigger stop jiffies difference =124742
<7>DEBUG: - pcm_timer_stop
<7>DEBUG: pcm prepare

I will go on searching for the reason, but I am thankful for any hint...