Arch Linux

Roken

Member

From: South Wales, UK

Registered: 2012-01-16

Posts: 1,366

Audio mystery

OK, the latest batch of updates breaks some aspects of my audio, using OSS. I have several sound sources, and most cause no problems (unused, for example HDMI audio and USB webcam mic). My used soundcard is a Creative X-Fi, and the motherboard has it's own audio, which is disabled in BIOS. I repeat, the MB audio is completely disabled in BIOS, so can someone explain this to me:

$ ossinfo
Version info: OSS 4.2 (b 2006/201202031749) (0x00040100) GPL
Platform: Linux/x86_64 3.2.2-1-ARCH #1 SMP PREEMPT Thu Jan 26 08:40:20 CET 2012 (Tex)

Number of audio devices:	5
Number of audio engines:	9
Number of MIDI devices:		0
Number of mixer devices:	2


Device objects
 0: osscore0 OSS core services
 1: oss_audigyls0 AudigyLS interrupts=531894 (531894)
 2: oss_hdaudio0 nVidia HD Audio interrupts=0 (31190)
    HD Audio controller nVidia HD Audio
    Vendor ID    0x10de0774
    Subvendor ID 0x1458a022
     Codec  0: Not present
 3: oss_usb0 USB audio core services
 4: usb045e00f5-0 USB sound device
 5: usb045e00f5-1 USB sound device

MIDI devices (/dev/midi*)

Mixer devices
 0: AudigyLS Mixer (Mixer 0 of device object 1)
 1: USB sound device (Mixer 0 of device object 4)

Audio devices
AudigyLS front                    /dev/oss/oss_audigyls0/pcm0  (device index 0)
AudigyLS center/lfe               /dev/oss/oss_audigyls0/pcm1  (device index 1)
AudigyLS surround                 /dev/oss/oss_audigyls0/pcm2  (device index 2)
AudigyLS 5.1 output               /dev/oss/oss_audigyls0/pcm3  (device index 3)
USB sound device rec              /dev/oss/usb045e00f5-1/pcmin0  (device index 4)

Nodes
  /dev/dsp -> /dev/oss/oss_audigyls0/pcm0
  /dev/dsp_in -> /dev/oss/oss_audigyls0/pcm0
  /dev/dsp_out -> /dev/oss/oss_audigyls0/pcm0
  /dev/dsp_ac3 -> /dev/oss/oss_audigyls0/pcm0
  /dev/dsp_mmap -> /dev/oss/oss_audigyls0/pcm0
  /dev/dsp_multich -> /dev/oss/oss_audigyls0/pcm3

Device No.2 - oss-hdaudio0 - is the on board audio, and it's always the one that's causing all the trouble when I upgrade (currently running on a backup). How is OSS even seeing this device if it's supposed to be disabled. If I allow updates I get kernel crashes on shutdown owing to OSS. The only fixes are to either prevent the modules loading at all (install oss-hdaudio /bin/false, just blacklisting doesn't do it) or to enable the on-board audio in BIOS. If it's enabled it interferes with sound generally, and preventing the modules causes other errors at boot. I want it to be treated as completely disabled and not as "possibly there" which is what oss seems to be doing right now. This has been driving me nuts for four days, now. So if anyone has any ideas I'm open to suggestions, then I can get my system updated again.

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