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Normally, the sound works properly in Ubuntu. Immediately: out of the box. But not for some computers. There are number of possible reasons for that. Here I will treat some of the most common causes.
In certain rare cases, Ubuntu has a problem with the presence of multiple active sound cards. Then it's therefore best, to have only one active sound card.
Solution: disable the on-board card (and / or the phone modem) in the BIOS. After you reboot your computer, the sound will come entirely through the PCI card.
If you can't find the disabling option of the on-board sound card (and / or the phone modem) in the BIOS, search the Internet for the manual for your motherboard.
The manufacturer of the motherboard usually has a downloadable version of the manual for you on his website. In case of a laptop, check the website of the laptop builder for a manual.
A. Install pavucontrol by means of Ubuntu Software Center.
B. Now start pavucontrol. Check the position of the sound channel sliders.
Note: don't put any slider higher than 90% (distortion).
Tip: It may be that the firmware of the soundcard is flawed, so that the slider for the master volume is under a different channel label than usual. Experiment a bit with combinations of open channels.
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Every six months there is a new Ubuntu version, each time with a new Linux kernel. The drivers for hardware, are embedded in the kernel.
a lot more of them on this website!
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