| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | config 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 | |
| 21 | config 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 | |
| 29 | config 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 | |
| 53 | config 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 | |