At Sun, 25 Jul 2010 19:51:39 +0300, Anssi Hannula wrote: > > Hi all! > > I have a motherboard with NVIDIA MCP7A HDMI audio. > However, multichannel audio is not mapped properly into the HDMI order. > > On 5.1, I get RL in FC, RR in LFE, FC in RL, LFE in RR. > > Interestingly, this is not consistent with the ALSA channel order (FL FR RL RR > FC LFE) being passed directly to HDMI (FL FR LFE FC RL RR). Instead it looks > like there has been a waveformatex (FL FR FC LFE RL RR; windows?) => HDMI > conversion instead of ALSA => HDMI. > > Same happens for 7.1. > > Is it possible to set the hardware to do an ALSA => HDMI conversion instead? > If not, we should manually compensate for this somewhere, right? Does the patch below change anything? > Somewhat relatedly, trying to output 4 channels results in silence only. Although 5.1/7.1 work? > Trying to output 3 or 5 channels triggers a timeout with I/O error, with the > following in the kernel log: "ALSA pcm_lib.c:1757: playback write error (DMA > or IRQ trouble?)" HD-audio doesn't support the odd number of channels in general, so they should be played as 4 or 6 channels. But, it looks like something wrong in the setup... thanks, Takashi --- diff --git a/sound/pci/hda/patch_nvhdmi.c b/sound/pci/hda/patch_nvhdmi.c index 3c10c0b..7355c60 100644 --- a/sound/pci/hda/patch_nvhdmi.c +++ b/sound/pci/hda/patch_nvhdmi.c @@ -511,6 +511,8 @@ static int patch_nvhdmi_8ch_7x(struct hda_codec *codec) codec->patch_ops = nvhdmi_patch_ops_8ch_7x; + init_channel_allocations(); + return 0; } _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
