under newer hand-rolled kernel, sound has gone away on ubuntu 11.04

[Frans Ketelaars]

On Thu, 16 Jun 2011 19:16:36 -0400, Robert P. J. Day wrote:

> technically speaking, not a ubuntu issue but i'm hoping someone here can
> point me in the right direction.  under my earlier 2.6.39-rc7-dirty
> kernel on 10.10, sound on my gateway NV79 laptop just plain worked. 
> under that earlier kernel, here's the output of a couple commands:
> 
> $lspci -v
> 00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset
> High Definition Audio (rev 05)
>         Subsystem: Acer Incorporated [ALI] Device 031c Flags: bus
>         master, fast devsel, latency 0, IRQ 42 Memory at d4400000
>         (64-bit, non-prefetchable) [size=16K] Capabilities: <access
>         denied>
>         Kernel driver in use: HDA Intel
>         Kernel modules: snd-hda-intel
> 
> $ cat /proc/asound/card0/codec* | grep Codec Codec: Realtek ALC272X
> Codec: Conexant ID 2c06
> Codec: Intel IbexPeak HDMI
> 
>   also, System->Preferences->Sound, "Hardware" showed:
> 
>     Internal Audio
>     1 Output / 1 Input
>     Analog Stereo Duplex
> 
> and "Test Speakers" worked fine, as did all other sound-related apps.
> 
>   now, having updated my kernel source and built and booted to a new
> kernel on 11.04:
> 
> $ uname -r
> 3.0.0-rc3-00165-gf8f44f0-dirty
> $
> 
> my sound has vanished.  no youtube, no playing music CDs, etc.
> 
>   the output of "lspci -v" and checking under /proc as above shows
> exactly the same output, but if i go under System->Preferences->Sound
> and look under the "Hardware" tab, it's *empty*, so there's nothing to
> select and test.
> 
>   based on what i've read, it seems that one possible solution is to
> edit the file /etc/modprobe.d/alsa-base.conf and, in my case, add a line
> of the form
> 
>   options snd-hda-intel model=????
> 
> then run "sudo alsa force-reload" to reload all the modules.  but i've
> tried several choices: generic, auto, and a few others, and nothing's
> worked.
> 
>   i'm open to suggestions.  clearly, it's a very bad thing that
> there's nothing listed under sound hardware, but i don't know how to
> reconfigure to get it back.  thoughts?
> 
> rday

http://ubuntuforums.org/showthread.php?t=1784313 might help.

Good luck!

    -Frans