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2 # TACPI DControl ACPI module behaviour
6 The ACPI driver provides support for the Advanced Configuration and
7 Power Management standard.
9 The ACPI kernel module is by default loaded automatically.
11 If the acpi_load variable is set, the ACPI module will be loaded.
12 The ACPI driver can be disabled with:
15 set hint.acpi.0.disabled=1
17 Note that the ACPI autodetection sets a number of hints to
18 pass information to the ACPI module. These should not be
19 overridden, or system behaviour will be undefined.
21 See acpi.4 man page (on booted system) for full description.
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24 # Treboot DReboot the system
28 Causes the system to immediately reboot.
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31 # Tbcachestat DDisplay disk block cache stats
35 Display disk block cache stats. For debugging use only.
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38 # Theap DDisplay memory management statistics
42 Requests debugging output from the heap manager. For debugging use
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46 # Tset Snum_ide_disks DSet the number of IDE disks
48 NOTE: this variable is deprecated, use root_disk_unit instead.
50 set num_ide_disks=<value>
52 When booting from a SCSI disk on a system with one or more IDE disks,
53 and where the IDE disks are the default boot device, it is necessary
54 to tell the kernel how many IDE disks there are in order to have it
55 correctly locate the SCSI disk you are booting from.
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58 # Tset Sboot_userconfig DStart Userconfig
62 Requests that the kernel's interactive device configuration program
63 be run when the kernel is booted.
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66 # Tset Sroot_disk_unit DForce the root disk unit number.
68 set root_disk_unit=<value>
70 If the code which detects the disk unit number for the root disk is
71 confused, e.g. by a mix of SCSI and IDE disks, or IDE disks with
72 gaps in the sequence (i.e. no primary slave), the unit number can be
73 forced by setting this variable.
75 See also vfs.root.mountfrom variable, under `set tunables' help item.
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