The pane Mobile Settings is only visible if you are using TinkerTool System on a mobile computer. The settings controlled by it are not available on desktop computers.
Mobile Apple computers with a hard drive usually contain a hardware feature known as Sudden Motion Sensor. This sensor measures the current acceleration of the computer and lets the system automatically protect the hard disk against destruction if a free fall of the computer is detected. The read/write heads will be moved into a safe parking position, so the drive won’t be destroyed even if the computer drops onto the ground. Under very specific circumstances however, it might be helpful to deactivate the sensor. When your computer is put into an environment with strong vibrations, the sensor could mistakenly think the system is falling, parking and un-parking the hard disks over and over again, causing a significant performance drop. For this case you can deactivate the motion sensor. To change the setting, perform the following steps:
If your computer is not equipped with a motion sensor, the option won’t be selectable. Only Apple’s original sensors that are under control of OS X will be affected by this setting, not other sensors inside some third-party hard drive models which are designed to work independently. Mobile Apple computers built in 2005 or later usually contain a sudden motion sensor unless the computer was shipped with flash memory.
You should never switch off the sensor unless absolutely necessary. Disabling the sensor is only recommended if you experience performance problems in environments with external vibrations, like live concert halls, recording studios, or dance clubs. It also makes sense to deactivate the sensor if you have replaced your hard drive by a third-party model which comes with its own motion sensor or by an Solid State Drive (SSD) which doesn’t need protection. The drive’s sensor and Apple’s sensor could influence each other, seriously degrading performance of the drive.
If you have a portable computer with a display lid, you can put your computer to sleep mode by closing the lid. OS X will automatically wake up the system when the lid is reopened later. Under some circumstances, this automatic wake-up may not be desired. You can prevent OS X from doing so by changing a system setting. Perform the following steps:
You can return to the normal setting Wake when lid is being opened any time.
When a computer enters sleep mode to save energy, most hardware parts will be shut down, but the main memory and the parts needed to wake up the computer still remain powered. Keeping the main memory in operation is necessary to maintain the current state of the computer. When waking up, the computer can just resume operations based on the still intact contents of its memory.
Problems will occur if the computer loses power during sleep mode: The contents of the main memory will be lost, and the computer cannot resume operations. Furthermore, the operating system has not been shut down properly. This is the same situation as losing power outside sleep mode. The operating system will have to be rebooted and it must perform recovery steps on all hard drives to return to a clean state.
For mobile computers, such situations are not uncommon, however, because the battery could be drained completely when the sleep period is very long. The user may also have attempted to replace the battery during sleep mode, not recognizing that the computer was actually on, but sleeping. A solution of this problem is possible if the computer is saving the whole contents of memory to a reserved area on its hard disk just before it enters sleep mode. In this case, the data on the disk can be used as a backup should the computer indeed lose the contents of its memory during sleep mode. This way, it can still restore its full internal state and just resume operations. When waking after a power failure, the computer just has to copy the contents from the reserved disk area back into main memory again.
Apple calls this protection feature Safe Sleep. Other vendors usually call it Hibernation Mode. At the technical level, this feature is called Suspend-to-Disk or ACPI state S4.
Not all computers are capable of supporting Safe Sleep. It requires special features in the hardware, in the firmware, and in the operating system. If an Apple system makes active use of Safe Sleep recovery during wake-up, you will recognize this by a gray progress bar which is laid over the normal screen image.
Safe Sleep is a useful feature, but it can also have disadvantages:
The Safe Sleep file can be smaller than RAM size due to use of compression techniques.
When using the latest operating system versions on modern mobile computer models, Apple introduced a new variation of energy control which combines the advantages of “normal” sleep mode with the ones of Safe Sleep. At first, the computer enters conventional sleep mode where memory is still supplied with voltage and fast wake-up is possible. After a certain amount of time has passed in this mode (and the battery still has energy), the computer automatically switches to Safe Sleep. In this special combination of conventional and Safe Sleep, switching to the “deeper” sleep mode is called “standby” by Apple.
Not all computer models, firmware versions and operating systems are capable of supporting standby. TinkerTool System detects automatically whether your system can use standby or not. The likelihood is very high when the following conditions are true:
TinkerTool System can control in detail which sleep mode should be used. The following three modes of operation are possible:
If your system is additionally capable of supporting standby, you can enable or disable it with the option Switch to standby after sleeping: The waiting time after which the system automatically goes from conventional to Safe Sleep mode can also be determined. Delays between 0 and 24 hours can be set by a slider.
Note that the setting Enable Immediate Hibernation is basically identical to Enable Safe Sleep combined with Switch to standby after sleeping 0 seconds. However, the first setting can even be used if your system is not supporting standby mode.
Perform the following steps to define the defaults for sleep mode:
The current size of the sleep file is shown in a box. If Safe Sleep is shut off, the file can be removed by pressing the button Delete file now. The reserved area on the hard drive will be returned to normal usage.
Depending on computer model, the Safe Sleep file might be recreated immediately after an energy saver setting has been modified with TinkerTool System, System Preferences, or similar applications.
By pressing the button Reset all you can set all sleep settings available in this tab item of TinkerTool System back to the defaults recommended by Apple. Please note that the default values can be different for each computer model.