Public bug reported:

I report this bug just for information, cause it took me several hours
to find out the solution.

--- System ---

Description:    Ubuntu 10.04.1 LTS
Release:        10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3


--- Problem ---

After installing Ubuntu 10.04 LTS on HP 625 Notebook, you won't get
sound through the internal notebook speaker. Line-out works perfectly.

The ALSA Information Script reports the wrong hardware: 
HDA-Intel - HDA ATI SB
IDT ID 7667

That's because of the wrong alsa driver version, missing the newest drivers:
Driver version:     1.0.21


--- Solution ---

You need alsa driver version 1.0.23 or higher. To install at least driver 
version 1.0.23 at this time, take the following steps:
* Activate the "Unsupported updates (lucid backports)" repository in Synaptic 
Package Manager (Settings -> Repositories -> Updates). 
* Reload your package information.
* Install the package "linux-backports-modules-alsa-lucid-generic". This will 
also install a new linux kernel version. 
* Restart and your sound should work properly.
* If not, raise all available volume levels in alsamixer (start alsamixer in 
terminal).

Now the ALSA Information Script reports the right hardware:
HDA-Intel - HDA ATI SB
IDT 92HD88B1

Best regards
Akaname

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Hewlett-Packard HP 625: no speaker sound in Ubuntu 10.04 (Lucid) fresh install
https://bugs.launchpad.net/bugs/606893
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