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* VIA VT1708 bugs
@ 2011-01-04  6:46 David Henningsson
  2011-01-04  7:43 ` Raymond Yau
  0 siblings, 1 reply; 6+ messages in thread
From: David Henningsson @ 2011-01-04  6:46 UTC (permalink / raw)
  To: ALSA Development Mailing List

Hi,

the state of VIA VT1708 in the current kernel is far from optimal. It 
would be good to improve the situation, at least for 2.6.38. On the 
machine here, I experience at least these bugs:

1) "Jack detect" switch has no function:

* When turning "Jack detect" off, quitting alsamixer, then restarting 
it, "Jack detect" is still on.
* When turning "Jack detect" off, then turning it on again, alsamixer 
crashes with the message "alsamixer: hcontrol.c:764: 
snd_hctl_handle_event: Assertion `elem' failed."

2) Plugging headphones in toggles "Front" switch control

* This should probably just be removed, especially with the latest 
opinion from Takashi of what "Front" really means. The problem is 
worsened by that PulseAudio seems to pick it up in some circumstances 
and thinks that it should mute everything.

3) Several users report headphones output being broken

* Symptoms vary a little and some might be due to bug 2), but some 
however report the headphones volume being "grayed out" in alsamixer. I 
haven't seen that in particular on the hardware here.

4) All these extra controls - "Independent HP", "Jack Detect", "Smart 5.1"

I assume they are meant to add extra functionality, and of course I 
don't mind that, but the problem is that since these are not very well 
described (or am I missing documentation somewhere?) it's difficult to 
know the exact intended functionality of these, and without knowing 
that, it's even more difficult to fix it when it's broken (or even 
knowing if it is broken or not!).

Any ideas and/or opinions? Should we talk to VIA about it, after all 
they seem to have written a lot of the code here? Or can someone here 
cast some light on these issues?

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: VIA VT1708 bugs
@ 2011-03-21  6:56 Raymond Yau
  0 siblings, 0 replies; 6+ messages in thread
From: Raymond Yau @ 2011-03-21  6:56 UTC (permalink / raw)
  To: ALSA Development Mailing List

>> *Independent* headphone
>>
>> http://www.viaarena.com/forums/showthread.p*hp*?t=41015 <http://www.viaarena.com/forums/showthread.php?t=41015>

>Ok, that makes some sense. It translates to me as
>* With *independent* *HP* turned off - activates auto-mute between
>speaker-out/line-out and headphone out. Note the difference between VIA
>and Realtek/Sigmatel here as line-out are auto-muted as well.

>* With *independent* *HP* turned on - headphone out and speaker-out/line-out
>should take output from different PCM subdevices.

Practically, it is more complex than the above since the desktop
motherboard can have 3 , 5 or 6 audio jacks at rear panel

since those hda codecs only have 8 channels instead of 10

Enable Independent HP on a 6stack model should decrease
spec->mult_out.max_channels from 8 to 6 for subdevice 0

For 5 jacks model , the driver need to retask blue jack as side only
when independent HP switch is off

To support 8 channels for a 3stack model need to retask the front HP as side

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-03-21  6:56 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-01-04  6:46 VIA VT1708 bugs David Henningsson
2011-01-04  7:43 ` Raymond Yau
2011-01-04  9:21   ` David Henningsson
2011-01-04 14:15     ` Raymond Yau
2011-01-04 23:32     ` Raymond Yau
  -- strict thread matches above, loose matches on Subject: below --
2011-03-21  6:56 Raymond Yau

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