[pulseaudio-tickets] [PulseAudio] #249: Complete system freeze when loading module-oss using nvsound kernel driver

[PulseAudio]

#249: Complete system freeze when loading module-oss using nvsound kernel driver
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 Reporter:  jocko         |       Owner:  lennart
     Type:  defect        |      Status:  new    
 Priority:  normal        |   Milestone:         
Component:  module-oss-*  |    Severity:  major  
 Keywords:                |  
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 My computer have an onboard nvidia soundstorm sound card, and to be able
 to use the hardware mixing and real-time dolby digital encoding, I need to
 run nvidias old (non-free) nvsound driver, which is OSS only (i.e does not
 work with alsa).

 In Ubuntu Gutsy Gibbon I have pulseaudio (v. 0.9.6) working nicely using
 module-oss to output sound to nvsound (on /dev/dsp).

 In Ubuntu Hardy Heron (with pulseaudio v. 0.9.9), whenever I try to load
 module-oss the entire system freezes up completely.

 The only way to recover is to press the reset button or turn off the power
 (Alt+SysRq+b does not help). I can start pulseaudio without module-oss,
 but that's pointless as it will not find any output sink.

 So I did some more testing in gutsy gibbon; I compiled versions 0.9.6,
 0.9.7 and 0.9.9. Of these, 0.9.6 is the only version that does not freeze
 (so the bug was introduced in version 0.9.7 and is still there).

 I guess this problem is hardware/driver specific and not that many people
 use the nvsound driver anymore so I fully understand it may be difficult
 to find the cause for this problem, especially as nvsound is closed
 source...
 If there are any log files or other information I can provide, I'll be
 happy to help...

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Ticket URL: <http://www.pulseaudio.org/ticket/249>
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