On Sat, Jun 13, 2015 at 6:14 AM, Raymond Yau superquad.vortex2@gmail.com wrote:
If your specifcaion and user guide does not mention the support of surround 5.1
You need to find out the internal subwoofer use both channel or just left or right
speaker-test -c4 -t wav -D hw:0,0
If you hear high frequency from subwoofer, this mean you need software low pass filtter
After removing all jacks and testing with speaker-test -c 4 -t wav -D hw:1,0
speaker-test 1.0.29
Playback device is hw:1,0 Stream parameters are 48000Hz, S16_LE, 4 channels WAV file(s) Rate set to 48000Hz (requested 48000Hz) Buffer size range from 32 to 524288 Period size range from 16 to 262144 Using max buffer size 524288 Periods = 4 was set period_size = 131072 was set buffer_size = 524288 0 - Front Left 1 - Front Right 3 - Rear Right 2 - Rear Left ^CTime per period = 9.384977
I can hear high frequency from internal subwoofer while speaker-test printed 3 and 2.
Two headphone jacks, internal speaker and subwoofer
There are only three playback volume controls
http://mailman.alsa-project.org/pipermail/alsa-devel/2015-June/093668.html
Your case are
A. 3 DACs, 2 HP, 2 speakers
Node 0x1a [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out Control: name="Bass Speaker Playback Switch", index=0, device=0 ControlAmp: chs=3, dir=Out, idx=0, ofs=0 Control: name="Speaker Surround Phantom Jack", index=0, device=0 Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0 Amp-In vals: [0x00 0x00] Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1 Amp-Out vals: [0x80 0x80] Pincap 0x0000373c: IN OUT HP Detect Vref caps: HIZ 50 GRD 80 100 Pin Default 0x90170130: [Fixed] Speaker at Int N/A Conn = Analog, Color = Unknown DefAssociation = 0x3, Sequence = 0x0 Misc = NO_PRESENCE Pin-ctls: 0x00: VREF_HIZ Unsolicited: tag=00, enabled=0 Power states: D0 D1 D2 D3 EPSS Power: setting=D0, actual=D0 Connection: 3 0x0c 0x0d* 0x0e