[vdr] VDR 1.7.5 + OSS can not control sound

[martinez at embl.de]

VDR 1.7.5 + oxine + HDMI output

I get sound through the HDMI socket which is good but there is no way to control
it from VDR (I am sure there is but I don't know how to)

The volume level on the screen goes left or right no problems, I can press the
mute button and it works too, except that the actual sound is unaffected.

I have OSS-4.1-1052

Can somebody help or at least point me in the right direction?

dmesg |grep HDA
[   65.298707] oss_hdaudio: Unknown HDA codec 0x10de0002
[   65.313732] oss_hdaudio: Unknown HDA codec 0x10de0002


and this is the output from ossinfo
Version info: OSS 4.1 (b 1052/200903240610) (0x00040100)
Platform: Linux/i686 2.6.27-11-generic #1 SMP Wed Apr 1 20:57:48 UTC 2009
(mythtv-vdr)

Number of audio devices:	9
Number of audio engines:	13
Number of mixer devices:	1

Device objects
 0: osscore0 OSS core services
 1: oss_hdaudio0 nVidia HD Audio interrupts=1576709 (1576710)
    HD Audio controller nVidia HD Audio
    Vendor ID    0x10de0774
    Subvendor ID 0x147b1c44
     Codec  0: ALC888 (0x10ec0888/0x147b0000)
     Codec  3: Unknown (0x10de0002/0x10de0101)
 2: oss_usb0 USB audio core services

Mixer devices
 0: High Definition Audio ALC888 (Mixer 0 of device object 1)

Audio devices
HD Audio play front               /dev/oss/oss_hdaudio0/pcm0  (device index 0)
HD Audio play rear                /dev/oss/oss_hdaudio0/pcm1  (device index 1)
HD Audio play center/LFE          /dev/oss/oss_hdaudio0/pcm2  (device index 2)
HD Audio play side                /dev/oss/oss_hdaudio0/pcm3  (device index 3)
HD Audio play pcm4                /dev/oss/oss_hdaudio0/pcm4  (device index 4)
HD Audio play spdif-out           /dev/oss/oss_hdaudio0/spdout0  (device index
5)
HD Audio play spdifout            /dev/oss/oss_hdaudio0/spdout1  (device index
6)
HD Audio rec mix                  /dev/oss/oss_hdaudio0/pcmin0  (device index 7)
HD Audio rec mix                  /dev/oss/oss_hdaudio0/pcmin1  (device index 8)