Trying it out involved buying a 5.1 amp. The patchset we have supports 6 or 8 channels, but it seems there's a problem actually using 6 due to detail of buffer size
# speaker-test -Dhw:1,0 -c6 speaker-test 1.0.24.2 Playback device is hw:1,0 Stream parameters are 48000Hz, S16_LE, 6 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 64 to 10922 Period size range from 32 to 5440 Using max buffer size 10920 Unable to set buffer size 10920 for playback: Invalid argument Setting of hwparams failed: Invalid argument If I tell it to use 8 it likes the buffer size better and proceeds with the test. # speaker-test -Dhw:1,0 -c8 speaker-test 1.0.24.2 Playback device is hw:1,0 Stream parameters are 48000Hz, S16_LE, 8 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 16 to 8192 Period size range from 8 to 4096 Using max buffer size 8192 Periods = 4 was set period_size = 2048 was set buffer_size = 8192 0 - Front Left 4 - Center 1 - Front Right 7 - Side Right 3 - Rear Right 2 - Rear Left 6 - Side Left ... on my reference monitor with stereo speakers, only the front left and right make a noise. I hooked it up to a bigger TV with the 5.1 amp on an optical link. It acted the same, cycling through all 8 channels but only making the hiss on the front left and right. So it's closer but not there yet. -- You received this bug notification because you are a member of TI OMAP Developers, which is subscribed to linaro-landing-team-ti. https://bugs.launchpad.net/bugs/919378 Title: Panda: hdmi audio only on 2 channels Status in Linaro Texas Instruments Landing Team: Won't Fix Status in Linaro Multimedia WG project: Won't Fix Status in Linaro Ubuntu Evaluation Builds: Confirmed Bug description: Installed the linarotv image 20120114-2 and hwpack_linaro-lt-panda-x11-base_20120106-1 on a Pandaboard ES with linaro-media-create. After boot installed ubuntu-omap4-extras-multimedia. HDMI connected to a Yamaha RX-V1800 audio-video-receiver and from there to a 1080p plasma. Verified multichannel audio with xbmc. xbmc settings: Audio output: HDMI Speaker Configuration: 5.1 Audio output device: Defaults (ALSA) Passthrough output devive: hdmi (ALSA) 1. when passthrough is enabled AC3 sound in videos does not work 2. when passthrough is disabled only 2 audio channels are transmitted to the AVR (AVR display has indicators showing which channels are in use) Crosschecked with alsa speaker-test (speaker-test -c6 -t wav) with same result: Output correct for front left, front right and center (the latter only because the pro-logic decoder in the AVR puts sound equal to left and right onto the center) but rear sound is played with low volume on the front speakers. Situation remains after update/dist-upgrade on Jan 21. 20:45CET. Attaching the EDID sent by the AVR in case the audio capabilities are used by the driver (EDID is recorded with SwitchResX on a MacBook). To manage notifications about this bug go to: https://bugs.launchpad.net/linaro-landing-team-ti/+bug/919378/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~tiomap-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~tiomap-dev More help : https://help.launchpad.net/ListHelp
