[alsa-devel] Realtek ACL892: audio gap ~ each 10 seconds? [SOLVED]
david.henningsson at canonical.com
Fri May 11 15:45:30 CEST 2012
2012-05-11 00:43, Takashi Iwai skrev:
> At Fri, 11 May 2012 04:01:23 -0300,
> Dâniel Fraga wrote:
>> On Fri, 11 May 2012 07:39:46 +0200
>> Takashi Iwai<tiwai at suse.de> wrote:
>>> Ah, it's the case... Yes, some mobos are badly designed not to handle
>>> the jack detection properly.
>>> Did the auto-mute actually work on your machine? If not, we can
>>> blacklist the device. Please give alsa-info.sh output.
>> Hi Takashi! Disabling the auto-mute solved the issue. Regarding
>> your question: in fact, I don't know why auto-mute was enabled, because
>> I never use a headphone.
> It's a driver feature that is enabled as default, no matter whether
> you use or not :)
>> So I can't test it.
> Does it mean that you have no headphone, or does the machine have no
> headphone jack?
>> But you can be sure that
>> with this motherboard (Asus P8Z68-V Pro/gen3) there's this "pop and
>> click" problem when Auto-mute is enabled.
> 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.)
In the long term, I think we should filter out short jack sense events.
That is, when we get an unsol jack event, check the current status and
set a timer for 200 ms.
200 ms later, in the timer callback, we would only accept the jack sense
event as valid (and do automute/autoswitch/kcontrol update) if
- The current status is the same as 200 ms earlier
- If there has not been more unsol events in the mean time
Question is whether to do this by default, or only for devices we know
I haven't seen this a lot, but the few I have seen have had times with
the wrong state below 100 ms, so I think 200 ms could be a good value to
David Henningsson, Canonical Ltd.
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