2 bool "Power Management support"
4 "Power Management" means that parts of your computer are shut
5 off or put into a power conserving "sleep" mode if they are not
6 being used. There are two competing standards for doing this: APM
7 and ACPI. If you want to use either one, say Y here and then also
8 to the requisite support below.
10 Power Management is most important for battery powered laptop
11 computers; if you have a laptop, check out the Linux Laptop home
12 page on the WWW at <http://www.linux-on-laptops.com/> or
13 Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
14 and the Battery Powered Linux mini-HOWTO, available from
15 <http://www.tldp.org/docs.html#howto>.
17 Note that, even if you say N here, Linux on the x86 architecture
18 will issue the hlt instruction if nothing is to be done, thereby
19 sending the processor to sleep and saving power.
21 config SOFTWARE_SUSPEND
22 bool "Software Suspend (EXPERIMENTAL)"
23 depends on EXPERIMENTAL && PM && SWAP
25 Enable the possibilty of suspendig machine. It doesn't need APM.
26 You may suspend your machine by 'swsusp' or 'shutdown -z <time>'
27 (patch for sysvinit needed).
29 It creates an image which is saved in your active swaps. By the next
30 booting the, pass 'resume=/dev/swappartition' and kernel will
31 detect the saved image, restore the memory from
32 it and then it continues to run as before you've suspended.
33 If you don't want the previous state to continue use the 'noresume'
34 kernel option. However note that your partitions will be fsck'd and
35 you must re-mkswap your swap partitions. It does not work with swap
38 Right now you may boot without resuming and then later resume but
39 in meantime you cannot use those swap partitions/files which were
40 involved in suspending. Also in this case there is a risk that buffers
41 on disk won't match with saved ones.
43 For more information take a look at Documentation/power/swsusp.txt.
46 bool "Suspend-to-Disk Support"
47 depends on PM && SWAP && X86 && !X86_64
49 Suspend-to-disk is a power management state in which the contents
50 of memory are stored on disk and the entire system is shut down or
51 put into a low-power state (e.g. ACPI S4). When the computer is
52 turned back on, the stored image is loaded from disk and execution
53 resumes from where it left off before suspending.
55 This config option enables the core infrastructure necessary to
56 perform the suspend and resume transition.
58 Currently, this suspend-to-disk implementation is based on a forked
59 version of the swsusp code base. As such, it's still experimental,
60 and still relies on CONFIG_SWAP.
62 More information can be found in Documentation/power/.
66 config PM_DISK_PARTITION
67 string "Default resume partition"
71 The default resume partition is the partition that the pmdisk suspend-
72 to-disk implementation will look for a suspended disk image.
74 The partition specified here will be different for almost every user.
75 It should be a valid swap partition (at least for now) that is turned
78 The partition specified can be overridden by specifying:
80 pmdisk=/dev/<other device>
82 which will set the resume partition to the device specified.
88 to inform the kernel not to perform a resume transition.
90 Note there is currently not a way to specify which device to save the
91 suspended image to. It will simply pick the first available swap