1config PM 2 bool "Power Management support" 3 ---help--- 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. 9 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>. 16 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. 20 21config PM_DEBUG 22 bool "Power Management Debug Support" 23 depends on PM 24 ---help--- 25 This option enables verbose debugging support in the Power Management 26 code. This is helpful when debugging and reporting various PM bugs, 27 like suspend support. 28 29config SOFTWARE_SUSPEND 30 bool "Software Suspend (EXPERIMENTAL)" 31 depends on EXPERIMENTAL && PM && SWAP 32 ---help--- 33 Enable the possibility of suspending the machine. 34 It doesn't need APM. 35 You may suspend your machine by 'swsusp' or 'shutdown -z <time>' 36 (patch for sysvinit needed). 37 38 It creates an image which is saved in your active swap. Upon next 39 boot, pass the 'resume=/dev/swappartition' argument to the kernel to 40 have it detect the saved image, restore memory state from it, and 41 continue to run as before. If you do not want the previous state to 42 be reloaded, then use the 'noresume' kernel argument. However, note 43 that your partitions will be fsck'd and you must re-mkswap your swap 44 partitions. It does not work with swap files. 45 46 Right now you may boot without resuming and then later resume but 47 in meantime you cannot use those swap partitions/files which were 48 involved in suspending. Also in this case there is a risk that buffers 49 on disk won't match with saved ones. 50 51 For more information take a look at <file:Documentation/power/swsusp.txt>. 52 53config PM_STD_PARTITION 54 string "Default resume partition" 55 depends on SOFTWARE_SUSPEND 56 default "" 57 ---help--- 58 The default resume partition is the partition that the suspend- 59 to-disk implementation will look for a suspended disk image. 60 61 The partition specified here will be different for almost every user. 62 It should be a valid swap partition (at least for now) that is turned 63 on before suspending. 64 65 The partition specified can be overridden by specifying: 66 67 resume=/dev/<other device> 68 69 which will set the resume partition to the device specified. 70 71 Note there is currently not a way to specify which device to save the 72 suspended image to. It will simply pick the first available swap 73 device. 74 75