1config PM 2 bool "Power Management support" 3 depends on !IA64_HP_SIM 4 ---help--- 5 "Power Management" means that parts of your computer are shut 6 off or put into a power conserving "sleep" mode if they are not 7 being used. There are two competing standards for doing this: APM 8 and ACPI. If you want to use either one, say Y here and then also 9 to the requisite support below. 10 11 Power Management is most important for battery powered laptop 12 computers; if you have a laptop, check out the Linux Laptop home 13 page on the WWW at <http://www.linux-on-laptops.com/> or 14 Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/> 15 and the Battery Powered Linux mini-HOWTO, available from 16 <http://www.tldp.org/docs.html#howto>. 17 18 Note that, even if you say N here, Linux on the x86 architecture 19 will issue the hlt instruction if nothing is to be done, thereby 20 sending the processor to sleep and saving power. 21 22config PM_DEBUG 23 bool "Power Management Debug Support" 24 depends on PM 25 ---help--- 26 This option enables verbose debugging support in the Power Management 27 code. This is helpful when debugging and reporting various PM bugs, 28 like suspend support. 29 30config SOFTWARE_SUSPEND 31 bool "Software Suspend" 32 depends on PM && SWAP && (X86 && (!SMP || SUSPEND_SMP)) || ((FVR || PPC32) && !SMP) 33 ---help--- 34 Enable the possibility of suspending the machine. 35 It doesn't need APM. 36 You may suspend your machine by 'swsusp' or 'shutdown -z <time>' 37 (patch for sysvinit needed). 38 39 It creates an image which is saved in your active swap. Upon next 40 boot, pass the 'resume=/dev/swappartition' argument to the kernel to 41 have it detect the saved image, restore memory state from it, and 42 continue to run as before. If you do not want the previous state to 43 be reloaded, then use the 'noresume' kernel argument. However, note 44 that your partitions will be fsck'd and you must re-mkswap your swap 45 partitions. It does not work with swap files. 46 47 Right now you may boot without resuming and then later resume but 48 in meantime you cannot use those swap partitions/files which were 49 involved in suspending. Also in this case there is a risk that buffers 50 on disk won't match with saved ones. 51 52 For more information take a look at <file:Documentation/power/swsusp.txt>. 53 54config PM_STD_PARTITION 55 string "Default resume partition" 56 depends on SOFTWARE_SUSPEND 57 default "" 58 ---help--- 59 The default resume partition is the partition that the suspend- 60 to-disk implementation will look for a suspended disk image. 61 62 The partition specified here will be different for almost every user. 63 It should be a valid swap partition (at least for now) that is turned 64 on before suspending. 65 66 The partition specified can be overridden by specifying: 67 68 resume=/dev/<other device> 69 70 which will set the resume partition to the device specified. 71 72 Note there is currently not a way to specify which device to save the 73 suspended image to. It will simply pick the first available swap 74 device. 75 76config SWSUSP_ENCRYPT 77 bool "Encrypt suspend image" 78 depends on SOFTWARE_SUSPEND && CRYPTO=y && (CRYPTO_AES=y || CRYPTO_AES_586=y || CRYPTO_AES_X86_64=y) 79 default "" 80 ---help--- 81 To prevent data gathering from swap after resume you can encrypt 82 the suspend image with a temporary key that is deleted on 83 resume. 84 85 Note that the temporary key is stored unencrypted on disk while the 86 system is suspended. 87 88config SUSPEND_SMP 89 bool 90 depends on HOTPLUG_CPU && X86 && PM 91 default y 92