{"action":"created","issue":{"url":"https://api.github.com/repos/raspberrypi/linux/issues/1000","labels_url":"https://api.github.com/repos/raspberrypi/linux/issues/1000/labels{/name}","comments_url":"https://api.github.com/repos/raspberrypi/linux/issues/1000/comments","events_url":"https://api.github.com/repos/raspberrypi/linux/issues/1000/events","html_url":"https://github.com/raspberrypi/linux/issues/1000","id":84085452,"number":1000,"title":"alsa: multichannel PCM unsupported","user":{"login":"wm4","id":1387750,"avatar_url":"https://avatars.githubusercontent.com/u/1387750?v=3","gravatar_id":"","url":"https://api.github.com/users/wm4","html_url":"https://github.com/wm4","followers_url":"https://api.github.com/users/wm4/followers","following_url":"https://api.github.com/users/wm4/following{/other_user}","gists_url":"https://api.github.com/users/wm4/gists{/gist_id}","starred_url":"https://api.github.com/users/wm4/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wm4/subscriptions","organizations_url":"https://api.github.com/users/wm4/orgs","repos_url":"https://api.github.com/users/wm4/repos","events_url":"https://api.github.com/users/wm4/events{/privacy}","received_events_url":"https://api.github.com/users/wm4/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":59,"created_at":"2015-06-02T15:59:56Z","updated_at":"2015-06-29T10:31:11Z","closed_at":null,"body":"Apparently this doesn't work yet. If I interpret [this](https://github.com/raspberrypi/linux/blob/rpi-3.18.y/sound/arm/bcm2835-pcm.c#L31) correctly, there is no kernel support for this yet. If I force ALSA to output more than 2 channels, none of them seem to arrive at the receiver either (unfortunately my receiver doesn't show the PCM format it gets).\r\n\r\nI wonder what the 8 sub devices are for?"},"comment":{"url":"https://api.github.com/repos/raspberrypi/linux/issues/comments/116596678","html_url":"https://github.com/raspberrypi/linux/issues/1000#issuecomment-116596678","issue_url":"https://api.github.com/repos/raspberrypi/linux/issues/1000","id":116596678,"user":{"login":"wm4","id":1387750,"avatar_url":"https://avatars.githubusercontent.com/u/1387750?v=3","gravatar_id":"","url":"https://api.github.com/users/wm4","html_url":"https://github.com/wm4","followers_url":"https://api.github.com/users/wm4/followers","following_url":"https://api.github.com/users/wm4/following{/other_user}","gists_url":"https://api.github.com/users/wm4/gists{/gist_id}","starred_url":"https://api.github.com/users/wm4/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wm4/subscriptions","organizations_url":"https://api.github.com/users/wm4/orgs","repos_url":"https://api.github.com/users/wm4/repos","events_url":"https://api.github.com/users/wm4/events{/privacy}","received_events_url":"https://api.github.com/users/wm4/received_events","type":"User","site_admin":false},"created_at":"2015-06-29T10:31:11Z","updated_at":"2015-06-29T10:31:11Z","body":"So I got a report that the analogue output is playing distorted with more than 2 channels. I can reproduce this even with hello_audio.bin.\r\n\r\nMeanwhile multichannel audio still sometimes doesn't work correctly (same problem as almost 3 weeks ago), and it's like the firmware either doesn't send the CEA channel layout data byte correctly, or the mysterious hdmi_channel_map works differently from what I expected. (Note that I can't test with kodi due to lack of an USB keyboard/mouse. So I don't know if there's just a difference in how my patch uses this command.)\r\n\r\nCurrently it seems like the only way to get actually working multichannel is via AC3 passthrough/transcoding."}}