I have a sony laptop. At first I was just having problems with the headphones. then I tried following procedures to repair the sound and things have gotten worse.
I followed the procedure to remove and re-install the alsa and pulse audio programs. This killed my sound completely. Now It only show "Dummy Output" in the asla settings. I can do a force reload and it will show the sound card until I reboot then its gone again. Even when I force a reload I still have no sound.
card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
Subdevice #0: subdevice #0