声卡是HDA nvidia ,芯片组是realtek alc888

alsa Mixer里面没有cd mixer control，其他mixer mixer control 都正常
命令行amixer scontrols ，输出为

Simple mixer control 'Master',0
Simple mixer control 'Headphone',0
Simple mixer control 'PCM',0
Simple mixer control 'Front',0
Simple mixer control 'Front Mic',0
Simple mixer control 'Front Mic Boost',0
Simple mixer control 'Surround',0
Simple mixer control 'Center',0
Simple mixer control 'LFE',0
Simple mixer control 'Side',0
Simple mixer control 'Line',0
Simple mixer control 'Mic',0
Simple mixer control 'Mic Boost',0
Simple mixer control 'IEC958',0
Simple mixer control 'IEC958 Default PCM',0
Simple mixer control 'Capture',0
Simple mixer control 'Capture',1
Simple mixer control 'Input Source',0
Simple mixer control 'Input Source',1

没有 Simple mixer control 'cd',0

目前无法从音频线听到声音，数字声音正常

有朋友知道问题所在么？

貌似没人注意到这个问题？大家都通过数据方式听cd么？

我的Silicon Integrated Systems [SiS] Azalia Audio Controller
也是有问题，不过8.04就支持挺好的。。。