I have installed Ubuntu 12 and i cant see any volume controller on it and so no audio player can detect any sound card and nothing shown in system setting -> sound - output tab.

but i can see my hard ware by typing this command :

aplay -l

Return :

List of PLAYBACK Hardware Devices ** card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic] Subdevices: 1/1 Subdevice #0:

subdevice #0 card 1: U0x4d90x20 [USB Device 0x4d9:0x20], device 0: USB

Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 card

2: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0] Subdevices:

1/1 Subdevice #0: subdevice #0

How can i activate sound ?

Edit :

This info may helep for the solution :

sudo lspci | grep Audio

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01) 04:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cedar HDMI Audio [Radeon HD 5400/6300 Series]