Set C-Media USB 7.1 sound card to six_channel for surround40

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alsa-project/alsa-lib pull request #319 was opened from runderwo:

This 7.1 analog sound card identifies as the following: 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device (lsusb)
 1 [ICUSBAUDIO7D   ]: USB-Audio - ICUSBAUDIO7D (/proc/asound/cards)

It has the following four-channel analog stream layout:
  Interface 1
    Altset 3
    Format: S16_LE
    Channels: 4
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
    Bits: 16
    Channel map: FL FR FC LFE
(/proc/asound/card1/stream0)

This layout makes it impossible to play audio to the surround (SL/SR) speakers plugged into the "Surround" jack in 4 channel mode.  Instead, set six_channel so that the six-channel layout will be used to access those speakers:
  Interface 1
    Altset 4
    Format: S16_LE
    Channels: 6
    Endpoint: 6 OUT (ADAPTIVE)
    Rates: 44100, 48000
    Bits: 16
    Channel map: FL FR FC LFE SL SR

Tested with speaker-test -Dsurround40:CARD=ICUSBAUDIO7D,DEV=0 -c4

The speaker system that required surround40 in order to downmix LFE into the front/rear mix is a Klipsch ProMedia v.2-400, which has 4 speakers and a subwoofer with an internal crossover, connected via front and rear stereo analog cables.

Request URL   : https://github.com/alsa-project/alsa-lib/pull/319
Patch URL     : https://github.com/alsa-project/alsa-lib/pull/319.patch
Repository URL: https://github.com/alsa-project/alsa-lib



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