448 CHAPTER 31 (Web hosting provider) OPTIMIZING YOUR SYSTEM Figure
448 CHAPTER 31 OPTIMIZING YOUR SYSTEM Figure 31-3. Remove the X from the check box alongside any service you would like to disable. Table 31-1 lists the various run-level services, along with a short description of what they do and whether it s safe for you to disable them. Only remove the check from the boxes of services you wish to deactivate! Don t disable any services that you think should be running or otherwise interfere with the run-level settings. There s a very real risk you will damage your setup by doing so. Limit your changes to the services you specifically want to remove. Note SysV Runlevel Config truncates the names of some services in the left hand column. In Table 31-1, I ve listed the services as stated by the program, and then continued the full name within square brackets for clarity. Table 31-1. Ubuntu Run Level Services Service Description acpi-supp[ort] Required for proper running of the Advanced Configuration and Power Interface (ACPI). It s vital to the correction functioning of Ubuntu, so don t disable it unless your computer uses the alternative Advanced Power Management (APM) system (see the apmd service). All modern computers use ACPI. acpid Also required for ACPI. Don t disable it. alsa At one time, this started the sound hardware, but it is no longer used. It s disabled by default in all run levels. alsa-utils Controls the volume of the system on startup. Don t disable it.