Hi, Takashi MCP7x use old HW design in HDMI, they don't support channel mapping like MCP89. It use nvhdmi_dig_playback_pcm_prepare_8ch() to prepare channel mapping and steam id,format.
Anssi Hannula Please try the following changes in patch_nvhdmi.c static hda_nid_t nvhdmi_con_nids_7x[4] = { /*front, rear, clfe, rear_surr */ - 0x6, 0x8, 0xa, 0xc, + 0x6, 0xa, 0x8, 0xc, };
Thanks Wei.
-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Monday, July 26, 2010 5:35 PM To: Anssi Hannula Cc: alsa-devel@alsa-project.org; Wei Ni Subject: Re: [alsa-devel] Wrong channel order with multichannel HDMI on MCP7A
At Mon, 26 Jul 2010 11:14:17 +0200, 私 wrote:
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?
Ah crap, it should be irrelevant. Wei, don't MCP 7x chips support the channel mapping as MCP 89?
thanks,
Takashi
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;
}
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