[ltp] apm sound script

[Bibek Sahu]

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Howdy all,

	I have a thinkpad A21p (which has a cs461x sound chip) running Linux
2.4.0 and ALSA 0.5.10a.  I also have the kernel's cs46xx driver built, but
it doesn't handle suspends worth crap, so I stick to ALSA (which at least
allows the soundcard to be used after an apm resume).

	However, the system won't go to sleep if the sound device is open (I
presume this is related to not putting the PCI bus to sleep, but I don't
know).  The attached script takes care of this problem and mixer settings.

	In my setup (Debian unstable), this goes into /etc/apm/event.d;  I
presume it's similar on RedHat and other such distributions.  Basically, if
you have esdctl installed (which presumably means you're running esd), it
uses that to suspend esound (which causes it to release the sound device)
before an apm suspend event and resume it after an apm resume event.  Also,
if you have alsactl installed (which presumably means you're using alsa), it
uses that to store your mixer settings before a suspend event and restore
your mixer settings after a resume event.  The former (esdctl stuff) is
necessary because the system won't go to sleep while the sound device is
open; the latter (alsactl stuff) is necessary because the mixer settings are
all garbled after a resume event.  I imagine it'd be very easy to add
support for aRts (the kde sound daemon), but since I don't know much about
it I can't say for sure.

	Note: you may have to edit the paths to the programs to match your
system.  It just adds a couple of directories to the search path and lets
the system find the program, so chances are you won't have to touch it...
but just be aware of it.  The setting is at the top of the script.

	If you're using esd and alsa on a debian unstable system, you need
the 'esound-clients' and 'alsa-utils' packages.

	And at 649 bytes, the script is significantly shorter than this
message. ;-)

Enjoy.
- Bibek

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