Hello.
I have a Gigabyte motherboard (GA7DXR+) with an integrated
Ensoniq/Creative CT5880 AudioPCI sound card. Here is the lspci output:
00:0e.0 Multimedia audio controller: Ensoniq CT5880 [AudioPCI] (rev 04)
Subsystem: Giga-byte Technology: Unknown device a001
Flags: bus master, slow devsel, latency 32, IRQ 12
I/O ports at e400 [size=64]
Capabilities: [dc] Power Management version 2
I am currently using the ens1371 driver from the alsa-driver-0.9.6rc6
tarball (built from source) with Kernel 2.4.14 on Redhat 7.2
My question is about using the line-in on the back of the sound card as
a second output for four channel sound. The ens1371 driver provides two
pcm devices, Device 0 for playback and capture and Device 1 for
playback. snd-pcm-oss properly maps these devices to /dev/dsp0 and
/dev/adsp0, and sound played through both devices comes out the line-out
(front channels).
The motherboard manual indicates that the sound card is able to produce
four channel sound by using the line-out for the two front channels and
the line-in for the rear two channels. The Windows drivers for this card
support this. alsamixer also provides controls for the "surround"
channels and separate "3D" controls for the front and surround channels.
I assume using the line-in as a second output requires driver support to
switch this feature on. I noticed a feature in the driver called "Line
in to AOUT", but this is ifdef'd to only work with a 1370 chip (I
believe the CT5880 is a 1373.) Would it be difficult to add this
feature? Is it documented by Creative?
Thanks for your help.
-Patrick
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