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[ubuntu] ubuntu 12.10 on Macbook 4,1: Speakers does not work

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http://ubuntuforums.org – Hi guys I'm experiencing problem with speakers on my macbook 4,1 with ubuntu 12.10. I found out that the speakers did not work when laptop was on battery. When I rebooted laptop to ubuntu with pluged power cabel it worked out. here are devices: me@mc:~$ lspci -nn 00:00.0 Host bridge [0600]: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub [8086:2a00] (rev 03) 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) [8086:2a02] (rev 03) 00:02.1 Display controller [0380]: Intel Corporation Mobile GM965/GL (Hardware)