Sound detection fixes

January 12, 2011 — BarryK

Thanks to shinobar who is testing Wary 5.0. These little fixes were posted on the forum:
http://murga-linux.com/puppy/viewtopic.php?t=63400&start=72

depmod
Shinobar put in a test to see if depmod needs to be run, in /usr/sbin/alsaconf. Actually, this should not be needed, it is a precaution -- the fact that shinobar has put it in, may mean that a situation has been encountered in which depmod did not run at first boot?

A note for shinobar and other developers, depmod-FULL is deprecated. I restored /sbin/depmod to the full version. A script can still execute the Busybox depmod by running "busybox depmod".
The '3builddistro' script in Woof has this code in it that ensures all puppies will conform:

#101012 if 'depmod-FULL' exists, rename it to 'depmod'... 101024

if [ ! -h rootfs-complete/sbin/depmod-FULL ];then #if hyperlink then assume to depmod.

 if [ -f rootfs-complete/sbin/depmod-FULL ];then

  mv -f rootfs-complete/sbin/depmod rootfs-complete/sbin/depmod-BB-NOTUSED

  mv -f rootfs-complete/sbin/depmod-FULL rootfs-complete/sbin/depmod

 fi

 ln -s depmod rootfs-complete/sbin/depmod-FULL

fi

Sound detection tweak
/etc/rc.d/rc.services that shinobar is referring to is actually in the 'zzz' package, which is a branch of Woof. Lucid 5.2 was built with the mainline Woof only, Wary 5.0 was built with Woof and the 'zzz' branch.

Shinobar has reported that adding a one second sleep provides reliable detection of sound. I think that I read that someone else confirmed this fix on their hardware.

I have applied this fix in the 'zzz' PET, not uploaded yet. However, I put the "sleep 1" into /etc/init.d/10alsa (not in rc.services) (10alsa is also in 'zzz'):

case "$1" in

 start)

  if [ -f /tmp/rc_d_rc_services_alsa_ok ];then #101121 see rc.services.

   sleep 1 #110111 shinobar: for reliable sound detection on HP Compac nc4010.

EDIT:
I had downloaded shinobar's fix a few days ago, but have just now seen his edit dated Jan 10. An improved fix for /etc/init.d/10alsa:

case "$1" in

 start)

  if [ -f /tmp/rc_d_rc_services_alsa_ok ];then #101121 see rc.services.

  #if [ "`lsmod | grep '^snd_'`" != "" ];then

   rm -f /var/lock/subsys/alsasound 2> /dev/null #or alsa will not start.

   #sometimes these don't all load...

   modprobe snd-mixer-oss

   modprobe snd-seq-oss

   modprobe snd-pcm-oss

   for I in $(seq 4); do #110111 shinobar: for reliable sound detection on HP Compac nc4010.

    [ -c /dev/mixer ] && break

    sleep 1

   done

Comments

sleep 2 in alsa
Username: playdayz
I had put a sleep 2 at the beginning of /etc/init.d/alsa at shinobar's hint. I do not believe we are getting reports of sound not detected--and before that we had gotten several during testing.

Re ALSA fix
Username: BarryK
"Regarding shinobar's fix that tests for existence of /dev/mixer in /etc/init.d/10alsa, it is also necessary to make sure that /dev/mixer is deleted at bootup. I have added a line in /etc/rc.d/rc.sysinit to ensure this (line 239): [code]#101119 new /sbin/pup_event_backend_modprobe, these must be deleted every boot... rm -f /etc/modprobe.d/alsa_card*.conf 2>/dev/null touch /etc/modules/firmware.dep.inst.${KERNVER} #make sure exists. rm -f /dev/ttyUSB* 2>/dev/null #101210 may have been left there if modem plugged in at shutdown. rm -f /dev/mixer 2>/dev/null #110113 make sure removed, see test in /etc/init.d/10alsa. mkdir /tmp/rc_sysinit #101210 for logging into. mkdir /tmp/pup_event_backend #101210 for logging into, see /sbin/pup_event_backend_modprobe. mkdir /tmp/simple_network_setup #101216 [/code]

/etc/init.d/alsa
Username: shinobar
"I have posted the generalized(may work on any Puppy) version of '/etc/init.d/alsa' at [url=http://sakurapup.browserloadofcoolness.com/viewtopic.php?f=33&t=1648#p14161]the Japanese Forum'[/url]. The same one is bult in the [url=http://www.murga-linux.com/puppy/viewtopic.php?t=63503]wary-500j05[/url]. 1. Wait 8(in max.) seconds for module snd_* is loaded. 2. Wait 4(in max.) seconds for the mixer device file is created 3. Save 'asound.state' if 'asla start' secceed. 4. 'alsa stop' updates the 'asound.state' only if it is already exists.

/dev/mixer
Username: BarryK
"I think that rc.services does need to delete /dev/mixer. /dev/mixer is already created in the wary_500.sfs. Therefore the test "[ -c /dev/mixer ] && break" will break immediately, the delay loop is useless. If this test is to be used,/dev/mixer has to either be removed from 'rootfs-skeleton' in Woof, or deleted early in /etc/rc.d/rc.services. I opted for the latter. When module 'snd_mixer_oss' loads, /dev/mixer is automatically created.

sound not working on Dell Optiplex GX1p
Username: George_III
"I applied Shinobar's and Barry's fixes to /etc/rc.d/rc.services and /etc/init.d/10alsa on the hope they would solve my problem with sound, but I still have the problem... Barry, I'd really appreciate if you take a look at [url=http://www.murga-linux.com/puppy/viewtopic.php?p=486903#486903]my post[/url] about alsaconf not working properly... Thank you very much in advance...

Tags: wary