[alsa-devel] Realtek ACL892: audio gap ~ each 10 seconds? [SOLVED]
tiwai at suse.de
Fri May 11 15:52:49 CEST 2012
[Re-added Cc to alsa-devel to let others following]
At Fri, 11 May 2012 10:37:44 -0300,
Dâniel Fraga wrote:
> On Fri, 11 May 2012 09:43:48 +0200
> Takashi Iwai <tiwai at suse.de> wrote:
> > Does it mean that you have no headphone, or does the machine have no
> > headphone jack?
> The machine has a headphone jack, but I never use a headphone.
> > That's why I'm asking to test. Usually when such a noise occurs due
> > to the auto-mute feature, it's because the bogus unsolicited events
> > are fired up too much although no jack is plugged actually. Thus
> > usually the auto-mute feature itself doesn't work in such a case
> > (either no hardware implementation or the hardware has its own
> > switching mechanism.)
> I understand. Ok... so you want me to plug the headphone and
> test if the auto-mute works right? Ok, I did that and yes, it works
> fine as expected (the audio from speakers is automatically muted when a
> headphone is inserted).
Hm, so it's strange that the auto-mute causes a problem.
Could you check which unsolicited events are triggered on your
machine? When you build your kernel with the tracing support
(CONFIG_TRACEPOINTS=y), you can enable the tracing via
% echo 1 > /sys/kernel/debug/tracing/events/hda/hda_unsol_event/enable
then after some time, gather the result by checking
/sys/kernel/debug/tracing/trace file. The output is like below.
% cat /sys/kernel/debug/tracing/trace
# tracer: nop
# entries-in-buffer/entries-written: 4/4 #P:4
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
<idle>-0  d.h3 10157.942108: hda_unsol_event:  res=10010020, res_ex=10
<idle>-0  d.h3 10158.848271: hda_unsol_event:  res=10010000, res_ex=10
Check whether the events come up frequently even without
plugging/unplugging any jacks. Usually this shouldn't happen. But in
the case of problematic hardware with the auto-mute, many bogus unsol
events are triggered.
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