[alsa-devel] [PATCH 1/2] ALSA: hda - Fix probing and stuttering on CMI8888 HD-audio controller

[Geoffrey McRae]

On Wed, 29 Oct 2014 08:50:53 +0100
Takashi Iwai <tiwai at suse.de> wrote:

> At Wed, 29 Oct 2014 07:21:24 +1100,
> Geoffrey McRae wrote:
> > 
> > I can confirm that disable of MSI is required as even Windows 7
> > 64bit does not enable this for Intel HDA. Out of curiosity I altered
> > the driver to use MSI-X with the same results, interrupts are never
> > received even though the PCI caps state that MSI is supported.
> > 
> > Playback is very poor and stutters if I do not allow snoop by
> > commenting out "case AZX_DRIVER_CMEDIA:" in
> > azx_check_snoop_available.
> 
> OK, so we have some conflicting results.  Possibly we need non-cached
> pages only for CORB/RIRB but leave the stream buffers?  Could you
> check the patch below?
> 

The patch works fine, no errors reported, if I however disable snoop it
continues to stutter.