Hi Takashi,
On Wed, Sep 21, 2011 at 04:43:15PM +0200, Takashi Iwai wrote:
At Wed, 21 Sep 2011 10:35:10 -0400, Forest Bond wrote:
On Wed, Sep 21, 2011 at 10:39:44AM +0200, Takashi Iwai wrote:
At Tue, 20 Sep 2011 15:05:34 -0400, Forest Bond wrote:
On Tue, Sep 20, 2011 at 09:22:23AM +0200, Takashi Iwai wrote:
At Mon, 19 Sep 2011 19:14:13 -0400, Forest Bond wrote:
On Fri, Sep 16, 2011 at 04:36:01PM -0400, Forest Bond wrote: > I have two boards with a VT1708: > > * VIA EPIA EX15000G > * VIA VB8002 > > I'm using VLC to play audio via PulseAudio to the analog outputs. The VB8002 > sounds great, but the EX15000G has random pops and clicks in the output. Both > machines are running exactly the same configuration (they are using the same > pre-built OS image).
[...]
As mentioned, the usual problem is the inaccurate DMA position reporting, especially when tsched=0 helped. It means a problem of HD-audio controller. We have already many workarounds in the driver code, but more investigations are needed in such a case...
Again, I'm happy to spend the time needed to get this fixed. If you can provide hints on where to look, that would be great. Can you point me at some git commits that fixed similar issues? I checked the git log but did not find any such commits that changed patch_via.c.
Well, there are a few possible causes. If it's something wrong in the codec side, it can be a PM code. The latest driver has a mixer enum "Dynamic Power-Control". Try to disable it.
This control is not enabled for the VT1708 codec because the set_widgets_power_state function pointer is not defined for this codec. I assume the hardware doesn't support the underlying feature? Or maybe it is just not implemented yet in the driver?
Thanks, Forest