[ubuntu] hp pavilion alsa driver

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http://ubuntuforums.org – Hi all, i have a sound problem on my pavilion I read some posts and finally installed alsa drivers and everything was working fine on the session after the driver installation. After shutting down and switching on my laptop the sound was working on the login screen but not on the rest of the session. I reinstalled the drivers and again the same. sound was working for the first session and then nothing. I really need some help and my sound back!!! Thanks in advance (Hardware)