I find that it is because qemu not configured with --enable-mixemu. now i have 
another two questions, please help me.
1. I run win7 as the guest, when i mute the speaker of media player, the 
line_out_ctl(./audio/spiceaudio.c) function was not called? but  
    "mute/unmute" button in the right bottom of guest desktop will call it.
 
2. if i only have a qemu-system-x86_64 image, is there any way to check the 
options it has been configured?   

Best Regards,
Stone

At 2014-11-19 06:20:25, "Tony Breeds" <t...@bakeyournoodle.com> wrote:
>On Tue, Nov 18, 2014 at 03:55:07PM +0800, li wrote:
>> Hi all,
>>  
>> i use qemu-system-x86_64 to run windows 7, and fund that "mute/unmute" 
>> button in the right bottom of guest desktop not work.
>>  
>> related info is as below:
>>  
>> $qemu-system-x86_64 --version
>> QEMU emulator version 1.4.0, Copyright (c) 2003-2008 Fabrice Bellard
>
><snip>
>
>> $uname -a
>> Linux mymachine 3.8.0-34-generic #49~precise1-Ubuntu SMP Wed Nov 13 18:05:00 
>> UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
>
>This is very old.  Any change you can update to the latest ubuntu LTS and try 
>there?
>
>If you can't update the whole distro it's be helpful to try a newer qemu.
>
>Yours Tony.

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