刚装的FC6，声卡能 识别，但是不能发声，请问该怎么办？

bilit2008

刚装的FC6，但是不能发声，请问该怎么办？
相关信息如下：

查看芯片
#lspci -v
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
        Subsystem: Dell Unknown device 01d2
        Flags: bus master, fast devsel, latency 0, IRQ 169
        Memory at efffc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
        Capabilities: [70] Express Unknown type IRQ 0
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Unknown (5)

查看alsa版本
# rpm -qa|grep alsa
alsa-lib-1.0.12-2.fc6
alsa-lib-devel-1.0.12-2.fc6
alsa-utils-1.0.12-3.fc6

参看modprobe.conf文件
cat /etc/modprobe.conf
alias eth0 e100
alias scsi_hostadapter ata_piix
options snd cards_limit=8
alias snd-card-1 snd-hda-intel
options snd-hda-intel index=1