On 2013-10-31 21:48, John Arbuckle wrote: > Public bug reported: > > 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 > ac97 > > 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. > > ** Affects: qemu > Importance: Undecided > Status: New >
Maybe this is just a regression: I'm using ac97 for a win7 guest for a while, and since recently (don't recall when precisely, some weeks maybe) I'm getting "main-loop: WARNING: I/O thread spun for 1000 iterations", a temporarily stuck guest and broken sound output. This used to work fine. Someone has to bisect, I didn't find the time yet. Jan
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