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[Qemu-devel] [Bug 1246890] Re: AC97 sound card crashes QEMU

From: John Arbuckle
Subject: [Qemu-devel] [Bug 1246890] Re: AC97 sound card crashes QEMU
Date: Fri, 11 Mar 2016 02:45:40 -0000

Turns out this problem was with another program called AudioJack. It
interferes with QEMU and prevents sound from working. Uninstalling
AudioJack made the AC97 sound card work again under Mac OS 10.6.

** Changed in: qemu
       Status: New => Fix Committed

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  AC97 sound card crashes QEMU

Status in QEMU:
  Fix Committed

Bug description:
  The AC97 sound card does not work. It stops QEMU on startup. The cause
  appears to be some kind of deadlock.

  Steps to reproduce:
  Just add -soundhw ac97 to QEMU's arguments. Example: qemu-system-ppc -soundhw 

  The example above is all it takes to reproduce the problem.

  This problem has been observed on Mac OS X and Debian Linux.

  I question whether the ac97 support ever worked. It is a file that was
  taken from VirtualBox and added to QEMU. I do know that VirtualBox's
  support for the ac97 sound card works perfectly.

  The exact line of code that stops QEMU in its tracks is located in the
  file main-loop.c, in the function os_host_main_loop_wait(), the call
  made to qemu_mutex_lock_iothread(). The is where QEMU stops under Mac
  OS X.

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