# grep SND /usr/src/linux/.config|grep =
CONFIG_SND=m
CONFIG_SND_TIMER=m
CONFIG_SND_PCM=m
CONFIG_SND_SEQUENCER=m
CONFIG_SND_OSSEMUL=y
CONFIG_SND_MIXER_OSS=m
CONFIG_SND_PCM_OSS=m
CONFIG_SND_PCM_OSS_PLUGINS=y
CONFIG_SND_SEQUENCER_OSS=y
CONFIG_SND_RTCTIMER=m
CONFIG_SND_SEQ_RTCTIMER_DEFAULT=y
CONFIG_SND_DYNAMIC_MINORS=y
CONFIG_SND_SUPPORT_OLD_API=y
CONFIG_SND_VERBOSE_PROCFS=y
CONFIG_SND_AC97_CODEC=m
CONFIG_SND_INTEL8X0=m

# grep SOUND /usr/src/linux/.config|grep =
CONFIG_SOUND=m

# uname -a
Linux localhost 2.6.21-gentoo-r3 #5 SMP PREEMPT Mon Jul 16 15:28:56 CEST 2007 i686 Intel(R) Pentium(R) 4 CPU 2.80GHz GenuineIntel GNU/Linux

# emerge -pv alsa-driver

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N    ] media-sound/alsa-driver-1.0.14  USE="-debug -midi -oss" ALSA_CARDS="intel8x0 -ad1816a -ad1848 -ad1848-lib -ad1889 -adlib -ali5451 -als100 -als300 -als4000 (-aoa) (-aoa-fabric-layout) (-aoa-onyx) (-aoa-soundbus) (-aoa-soundbus-i2s) (-aoa-tas) (-aoa-toonie) (-armaaci) -asihpi (-at91-soc) (-at91-soc-eti-b1-wm8731) -atiixp -atiixp-modem (-au1x00) -au8810 -au8820 -au8830 -azt2320 -azt3328 -bt87x -ca0106 -cmi8330 -cmipci -cs4231 -cs4231-lib -cs4232 -cs4236 -cs4281 -cs46xx -cs5535audio -darla20 -darla24 -dt019x -dummy -echo3g -emu10k1 -emu10k1x -ens1370 -ens1371 -es1688 -es18xx -es1938 -es1968 -es968 -fm801 -fm801-tea575x -gina20 -gina24 -gusclassic -gusextreme -gusmax (-harmony) -hda-intel -hdsp -hdspm -ice1712 -ice1724 -indigo -indigodj -indigoio -intel8x0m -interwave -interwave-stb -korg1212 -layla20 -layla24 -loopback -maestro3 -mia -miro -mixart -mona -mpu401 -msnd-pinnacle -mtpav -mts64 -nm256 -opl3sa2 -opti92x-ad1848 -opti92x-cs4231 -opti93x -pc98-cs4232 -pcsp -pcxhr -pdaudiocf -pdplus -portman2x4 (-powermac) (-pxa2xx-i2sound) (-pxa2xx-soc) (-pxa2xx-soc-corgi) (-pxa2xx-soc-poodle) (-pxa2xx-soc-spitz) (-pxa2xx-soc-tosa) -riptide -rme32 -rme96 -rme9652 -s3c2410 -sa11xx-uda1341 -sb16 -sb8 -sbawe -seq-dummy -serial-u16550 -sgalaxy -soc -sonicvibes -sscape (-sun-amd7930) (-sun-cs4231) (-sun-dbri) -trident -usb-audio -usb-usx2y -via82xx -via82xx-modem -virmidi -vx222 -vxpocket -wavefront -ymfpci" 0 kB 

Total: 1 package (1 new), Size of downloads: 0 kB

#ls -l /boot
total 5275
lrwxrwxrwx 1 root root       1 2006-12-18 19:45 boot -> .
-rw-r--r-- 1 root root  489824 2007-04-05 00:52 fbsplash-custom-1024x768
drwxr-xr-x 2 root root    1024 2007-07-06 11:51 grub
-rw-r--r-- 1 root root 2463824 2007-05-15 13:29 krnl-2.6.21
-rw-r--r-- 1 root root 2417680 2007-07-16 16:00 krnl-2.6.21-r3
drwx------ 2 root root    1024 2002-01-01 01:00 lost+found

#ls -l /usr/src
total 47
-rw-r--r--  1 root root 35213 2007-02-02 12:39 config
lrwxrwxrwx  1 root root    22 2007-07-06 08:12 linux -> linux-2.6.21-gentoo-r3
drwxr-xr-x 20 root root  1328 2007-04-14 10:02 linux-2.6.19-gentoo
drwxr-xr-x 20 root root  1328 2007-04-14 10:17 linux-2.6.19-gentoo-r2
drwxr-xr-x 20 root root  1328 2007-04-14 10:21 linux-2.6.19-gentoo-r3
drwxr-xr-x 20 root root  1328 2007-04-14 10:06 linux-2.6.19-gentoo-r4
drwxr-xr-x 20 root root  1328 2007-04-14 10:09 linux-2.6.19-gentoo-r5
drwxr-xr-x 20 root root  1328 2007-04-14 10:14 linux-2.6.20-gentoo
drwxr-xr-x 19 root root   712 2007-04-14 09:54 linux-2.6.20-gentoo-r1
drwxr-xr-x 20 root root  1328 2007-04-15 11:44 linux-2.6.20-gentoo-r4
drwxr-xr-x 19 root root   712 2007-04-14 09:50 linux-2.6.20-gentoo-r5
drwxr-xr-x 19 root root   712 2007-04-22 13:45 linux-2.6.20-gentoo-r6
drwxr-xr-x 20 root root  1352 2007-05-15 13:15 linux-2.6.21-gentoo
drwxr-xr-x 19 root root   736 2007-05-24 15:02 linux-2.6.21-gentoo-r1
drwxr-xr-x 20 root root  1352 2007-07-16 15:28 linux-2.6.21-gentoo-r3
drwxr-xr-x  2 root root   160 2007-02-02 12:39 patches
drwxr-xr-x  7 root root   168 2007-02-02 12:24 rpm

# cat /etc/modules.d/alsa

alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
alias snd-card-0 snd-intel8x0
alias sound-slot-0 snd-intel8x0

# cat /proc/asound/cards
 0 [I82801DBICH4   ]: ICH4 - Intel 82801DB-ICH4
                      Intel 82801DB-ICH4 with VIA1612A at irq 17

# cat /etc/portage/package.use
media-libs/alsa-lib alsa_pcm_plugins_empty alsa_pcm_plugins_asym alsa_pcm_plugins_plug  alsa_pcm_plugins_alaw alsa_pcm_plugins_asym alsa_pcm_plugins_copy alsa_pcm_plugins_dmix alsa_pcm_plugins_dshare alsa_pcm_plugins_dsnoop alsa_pcm_plugins_empty alsa_pcm_plugins_extplug alsa_pcm_plugins_file alsa_pcm_plugins_hooks al sa_pcm_plugins_iec958 alsa_pcm_plugins_ioplug alsa_pcm_plugins_ladspa alsa_pcm_p lugins_lfloat alsa_pcm_plugins_linear alsa_pcm_plugins_meter alsa_pcm_plugins_mu law alsa_pcm_plugins_multi alsa_pcm_plugins_null alsa_pcm_plugins_plug alsa_pcm_ plugins_rate alsa_pcm_plugins_route alsa_pcm_plugins_share alsa_pcm_plugins_shm alsa_pcm_plugins_softvol alisp alsa_pcm_plugins_adpcm alsa_pcm_plugins_iec958 alsa_pcm_plugins_lfloat alsa_pcm_plugins_mulaw alsa_pcm_plugins_rate