(In reply to Takashi Iwai from comment #145)
> Hm, that's werid. Basically non-blocking mode matters only at opening the
> PCM device (whether the stream is busy or not), and it shouldn't influence
> on the running stream. Maybe it's a timing issue, like other tests failed
> sometimes...
>
> Did you already try using non-cached buffer in addition to the ATI-SB
> snooping?
> Try the change like the below:
>
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -1986,7 +1986,7 @@ static int dma_alloc_pages(struct hdac_bus *bus,
> {
> struct azx *chip = bus_to_azx(bus);
>
> - if (!azx_snoop(chip) && type == SNDRV_DMA_TYPE_DEV)
> + if (/*!azx_snoop(chip) &&*/ type == SNDRV_DMA_TYPE_DEV)
> type = SNDRV_DMA_TYPE_DEV_UC;
> return snd_dma_alloc_pages(type, bus->dev, size, buf);
> }
> @@ -2002,7 +2002,7 @@ static void pcm_mmap_prepare(struct snd_pcm_substream
> *substream,
> #ifdef CONFIG_X86
> struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
> struct azx *chip = apcm->chip;
> - if (chip->uc_buffer)
> + if (1 /*chip->uc_buffer*/)
> area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
> #endif
> }
Yes, the issue is still present. I've applied attachment 283955 and your
last patch together.
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Title:
Microphone distorted sound on ALC892/1220 on AMD chipsets
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