Re: [LAU] no sound from laptop speakers

On Mon, Oct 26, 2009 at 12:16:57PM +0200, Antanas Budri?nas wrote:
> I have rather strange problem.
> There is HP 6735b laptop with integrated audio -
> Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
> but IMHO sound chip isn't relevant at all.
> OS: Ubuntustudio 9.04
> I can hear sound playback through headphones' output but no sound from
> built-in speakers (with headphones disconnected).
> Alsamixer shows all playback levels high and unmuted.
> Win Vista (dual boot) playbacks audio through laptops speaker easely.

Okay, good, that last bit shows there isn't electrical damage. If there
was, then the head-phone present (hp) feature may misbehave. I've had
experience of that: http://quozl.linux.org.au/2008-12-19-hp-present/

Unlike what you say, I think the sound chip is critical. The Intel HDA
is often used with head-phone present feature ... so that when you plug
in the head-phone the amplifier is cut off. But that is done by
software; by the driver.

In older sound cards the switching was done using a mechanical switch
inside the socket. This tended to be unreliable over time.

You either have the wrong driver loaded, or the wrong options for the
driver, or the driver is faulty. That the driver in the other operating
system works is good data.

Grab a copy of the Ubuntu 9.10 release candidate, boot from CD, and see
if it is fixed in that. If so, wait for Ubuntustudio 9.10 or later.

-- 
James Cameron
http://quozl.linux.org.au/
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