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FreeBSD 6.2 on IBM/Lenovo ThinkPad T42 Laptop
Getting Sound to Work
Problem: I try to play music/CD/mp3's with xmms/mpg123/x11amp and I get some error message about
the sound device not being configured.
Solution You probably have not loaded the FreeBSD kernel module that talks to /dev/pcm0, which is what
the kernel calls your soundcard. These modules ( files ending in .ko ) implement device-specific stuff, so it makes sense to only load
the ones that you actually have.
Try the command
<![CDATA[
# kldload snd_ich
]]>
You should see lines something like these in your /var/log/messages :
<![CDATA[
Jun 14 12:26:42 polyglot kernel: pcm0: <Intel ICH4 (82801DB)> port 0x1c00-0x1cff,0x18c0-0x18ff
mem 0xc0000c00-0xc0000dff,0xc0000800-0xc00008ff irq 11 at device 31.5 on pci0
Jun 14 12:26:43 polyglot kernel: pcm0: <Analog Devices AD1981B AC97 Codec>
]]>
You can look at the list of currently loaded kernel modules with the kldstat command, which should have output something like this:
<![CDATA[
Id Refs Address Size Name
1 11 0xc0400000 617fd4 kernel
2 1 0xc0a1a000 59d60 acpi.ko
3 1 0xc44f0000 a000 ntfs.ko
4 1 0xc4776000 16000 linux.ko
5 1 0xc47da000 d000 msdosfs.ko
32 1 0xc469c000 5000 snd_ich.ko
33 1 0xc4bfc000 1c000 sound.ko
]]>
Now if you put the following line in your /boot/loader.conf file, this will happen automatically
at boot
<![CDATA[
snd_ich_load="YES"
]]>
If this does not work, than all is not lost. There is an all-in-one sound module called snd_driver. If you
run the command
<![CDATA[
# kldload snd_driver
]]>
as root and then look at kldstat, you should see about twenty different sound modules loaded. Then look in /var/log/messages
for stuff referring to /dev/pcm*. This can be accomplished with
<![CDATA[
tail -n 100 /var/log/messages | grep pcm
]]>
Good luck!
Putting Laptop into sleep mode
Problem: You want to put the the laptop to sleep on command.
Solution There are fancy settings to get the laptop to sleep when the lid is closed, but I do not like those "features." I define a simple bash alias
<![CDATA[
alias gotosleep="killall -9 xmms;acpiconf -s S3"
]]>
If you put this into your .bashrc in your home directory, then run
<![CDATA[
source .bashrc
]]>
to read in the new alias. Now you can run the command gotosleep as root to put the laptop to sleep. Since I always
have a root shell open, this is not a problem for me, but you could set this up as a SETUID root program so that it can be run
as a normal user, but SETUID root programs have cooties.
PS: The kill command for xmms was needed because I noticed that acpiconf would hang if xmms was running and then the laptop
had to be manually rebooted. YMMV.
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