10-21-2009
Thanks, guys -- great responses. That pretty much answers my questions, but it did raise a few more.
1.) pludi, I was curious what you meant when you said "But I suggest setting up the new system on different hardware, since it won't be as much trouble should you need to re-install." Maybe I'm just being thick, but I can't figure out what you meant by this. Could you elaborate if you get a chance? Thanks!
2.) There were two recommendations for OpenSolaris in these posts. I can probably research this myself, so don't spend too much time answering this, but what is the difference between Solaris and OpenSolaris. I assume the main difference is that OpenSolaris is open source, but what exactly does that mean? I mean I know the technical definition, that the source code is available to read and alter if you want, but what does it mean in terms of the operating system itself? Does Solaris have functionality that OpenSolaris doesn't, or vice versa?
3.) jp, you mentioned this: "And why buy when all the great ones are free. You buy when you want more support than you get from reading man pages and asking question in places like this." This is a very good point. Is this true, that the only thing you get more of when you buy it is support, and that there's no real difference in functionality? If that's true then I would definitely be inclined to go for a free one.
4.) The OS's I've been considering are RedHat Linux, Fedora Linux, Ubuntu Linux, Solaris, and BSD. Given the information I gave in the last post (about being a developer and whatnot), should I cross any of these off the list, or should I add any new ones to the list? jp mentioned CentOS -- I don't know anything about this one. I definitely want to have a lot of languages available to develop with (like pludi mentioned about Linux). So I guess I'm just asking if anyone has any further input on this. Other than that, thanks a lot for your replies -- they are very much appreciated.
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ASMC(4) BSD Kernel Interfaces Manual ASMC(4)
NAME
asmc -- device driver for the Apple System Management Console (SMC)
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device asmc
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
asmc_load="YES"
DESCRIPTION
The asmc driver controls the Apple System Management Console (SMC for short) found on Intel Apple systems.
The SMC is known to be found on the following systems:
o MacBook
o MacBook Pro
o Intel MacMini
o Mac Pro
o MacBook Air
o Intel iMac
With this driver, you can configure your keyboard backlight brightness, check temperatures of several sensors, check the speed of the inter-
nal fans and check the status of the Sudden Motion Sensor.
Variables related to the SMC control and inspection are exported via sysctl(3) under the device tree dev.asmc.
KEYBOARD BACKLIGHT
On MacBook Pro systems, you can control the keyboard brightness by writing a value to the dev.asmc.%d.light.control sysctl MIB.
The following sysctl MIBs contains the raw value returned by the left and right light sensors: dev.asmc.%d.light.left or
dev.asmc.%d.light.right.
TEMPERATURES
The number of temperature sensors and their description varies among systems. You can inspect the temperature sensors on your system by
traversing the dev.asmc.temp sysctl MIB.
All values are in degrees celsius.
SYSTEM FANS
The dev.asmc.fan.%d sysctl tree contains the leaf nodes speed, safespeed, minspeed, maxspeed and targetspeed. Each of these leaf nodes rep-
resent the current fan speed, the safest minimum fan speed, the minimum speed and the maximum speed respectively.
All values are in RPM.
SUDDEN MOTION SENSOR
The Sudden Motion Sensor (SMS for short) is a device that detects laptop movement and notifies the operating system via an interrupt. The
sysctl MIBs present under dev.asmc.sms all relate to the SMS.
The most interesting usage of this device is to park the disk heads when the laptop is moved harshly. First, you need to install ataidle(8)
(ports/sysutils/ataidle) and then configure devd(8) the following way:
notify 0 {
match "system" "ACPI";
match "subsystem" "asmc";
action "/usr/local/sbin/ataidle -s X Y";
};
Do not forget to change the X and Y values in the command above.
Also, please note that parking the disk heads too many times can dramatically reduce your hard drive's life span. Do not rely solely on the
SMS to protect your hard drive: good care and common sense can increase your hard drive's life.
SEE ALSO
ataidle(8) (ports/sysutils/ataidle), devd(8), sysctl(8)
HISTORY
The asmc driver first appeared in FreeBSD 8.0.
AUTHORS
Rui Paulo <rpaulo@FreeBSD.org> (Google Summer of Code project)
BUGS
Support for the latest models was never tested and is most likely not fully working.
BSD
July 27, 2009 BSD