This is a note to let you know that I've just added the patch titled ALSA: hda - hdmi: Fallback to ALSA allocation when selecting CA to the 3.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: alsa-hda-hdmi-fallback-to-alsa-allocation-when-selecting-ca.patch and it can be found in the queue-3.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 18e391862cceaf43ddb8eb5cca05e1a83abdebaa Mon Sep 17 00:00:00 2001 From: Anssi Hannula <anssi.hannula@xxxxxx> Date: Sun, 1 Sep 2013 14:36:47 +0300 Subject: ALSA: hda - hdmi: Fallback to ALSA allocation when selecting CA From: Anssi Hannula <anssi.hannula@xxxxxx> commit 18e391862cceaf43ddb8eb5cca05e1a83abdebaa upstream. hdmi_channel_allocation() tries to find a HDMI channel allocation that matches the number channels in the playback stream and contains only speakers that the HDMI sink has reported as available via EDID. If no such allocation is found, 0 (stereo audio) is used. Using CA 0 causes the audio causes the sink to discard everything except the first two channels (front left and front right). However, the sink may be capable of receiving more channels than it has speakers (and then perform downmix or discard the extra channels), in which case it is preferable to use a CA that contains extra channels than to use CA 0 which discards all the non-stereo channels. Additionally, it seems that HBR (HD) passthrough output does not work on Intel HDMI codecs when CA is set to 0 (possibly the codec zeroes channels not present in CA). This happens with all receivers that report a 5.1 speaker mask since a HBR stream is carried on 8 channels to the codec. Add a fallback in the CA selection so that the CA channel count at least matches the stream channel count, even if the stream contains channels not present in the sink speaker descriptor. Thanks to GrimGriefer at OpenELEC forums for discovering that changing the sink speaker mask allowed HBR output. Reported-by: GrimGriefer Reported-by: Ashecrow Reported-by: Frank Zafka <kafkaesque1978@xxxxxxxxx> Reported-by: Peter Frühberger <fritsch@xxxxxxxx> Signed-off-by: Anssi Hannula <anssi.hannula@xxxxxx> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/pci/hda/patch_hdmi.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -553,6 +553,17 @@ static int hdmi_channel_allocation(struc } } + if (!ca) { + /* if there was no match, select the regular ALSA channel + * allocation with the matching number of channels */ + for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) { + if (channels == channel_allocations[i].channels) { + ca = channel_allocations[i].ca_index; + break; + } + } + } + snd_print_channel_allocation(eld->info.spk_alloc, buf, sizeof(buf)); snd_printdd("HDMI: select CA 0x%x for %d-channel allocation: %s\n", ca, channels, buf); Patches currently in stable-queue which might be from anssi.hannula@xxxxxx are queue-3.11/alsa-hda-hdmi-fallback-to-alsa-allocation-when-selecting-ca.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html