I recently did a clean install of Ubuntu 12.04 on a Sony Vaio VPCS131FD. Yet the audio duplex option is missing on my sound option and the computer no longer does jack detection. And I think the sound is a bit weaker now but I am not sure. This computer worked under 11.10.
aplay -l output:
**** List of PLAYBACK Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC275 Analog [ALC275 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0
lspci | grep Audio output:
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)