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

[chris]

On Thu, 2011-06-16 at 19:16 -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
> 
> -- 
> 
> ========================================================================
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                         http://crashcourse.ca
> 
> Twitter:                                       http://twitter.com/rpjday
> LinkedIn:                               http://ca.linkedin.com/in/rpjday
> ========================================================================
> 

I found that it needed options snd-hda-intel model=laptop to get it
working for me

-- 
Cheers the Kiwi