7726942fb1
Currently ARM and MIPS both have nearly identical copies of the APM emulation code in their arch code. Add yet another copy of it to drivers char and make it selectable through SYS_SUPPORTS_APM_EMULATION. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
159 lines
6.2 KiB
Text
159 lines
6.2 KiB
Text
config PM
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bool "Power Management support"
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depends on !IA64_HP_SIM
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---help---
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"Power Management" means that parts of your computer are shut
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off or put into a power conserving "sleep" mode if they are not
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being used. There are two competing standards for doing this: APM
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and ACPI. If you want to use either one, say Y here and then also
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to the requisite support below.
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Power Management is most important for battery powered laptop
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computers; if you have a laptop, check out the Linux Laptop home
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page on the WWW at <http://www.linux-on-laptops.com/> or
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Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
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and the Battery Powered Linux mini-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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Note that, even if you say N here, Linux on the x86 architecture
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will issue the hlt instruction if nothing is to be done, thereby
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sending the processor to sleep and saving power.
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config PM_LEGACY
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bool "Legacy Power Management API (DEPRECATED)"
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depends on PM
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default n
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---help---
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Support for pm_register() and friends. This old API is obsoleted
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by the driver model.
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If unsure, say N.
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config PM_DEBUG
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bool "Power Management Debug Support"
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depends on PM
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---help---
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This option enables verbose debugging support in the Power Management
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code. This is helpful when debugging and reporting various PM bugs,
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like suspend support.
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config DISABLE_CONSOLE_SUSPEND
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bool "Keep console(s) enabled during suspend/resume (DANGEROUS)"
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depends on PM && PM_DEBUG
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default n
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---help---
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This option turns off the console suspend mechanism that prevents
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debug messages from reaching the console during the suspend/resume
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operations. This may be helpful when debugging device drivers'
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suspend/resume routines, but may itself lead to problems, for example
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if netconsole is used.
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config PM_TRACE
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bool "Suspend/resume event tracing"
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depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL
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default n
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---help---
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This enables some cheesy code to save the last PM event point in the
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RTC across reboots, so that you can debug a machine that just hangs
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during suspend (or more commonly, during resume).
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To use this debugging feature you should attempt to suspend the machine,
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then reboot it, then run
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dmesg -s 1000000 | grep 'hash matches'
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CAUTION: this option will cause your machine's real-time clock to be
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set to an invalid time after a resume.
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config PM_SYSFS_DEPRECATED
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bool "Driver model /sys/devices/.../power/state files (DEPRECATED)"
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depends on PM && SYSFS
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default n
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help
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The driver model started out with a sysfs file intended to provide
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a userspace hook for device power management. This feature has never
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worked very well, except for limited testing purposes, and so it will
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be removed. It's not clear that a generic mechanism could really
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handle the wide variability of device power states; any replacements
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are likely to be bus or driver specific.
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config SOFTWARE_SUSPEND
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bool "Software Suspend"
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depends on PM && SWAP && ((X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP))
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---help---
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Enable the possibility of suspending the machine.
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It doesn't need ACPI or APM.
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You may suspend your machine by 'swsusp' or 'shutdown -z <time>'
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(patch for sysvinit needed).
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It creates an image which is saved in your active swap. Upon next
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boot, pass the 'resume=/dev/swappartition' argument to the kernel to
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have it detect the saved image, restore memory state from it, and
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continue to run as before. If you do not want the previous state to
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be reloaded, then use the 'noresume' kernel argument. However, note
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that your partitions will be fsck'd and you must re-mkswap your swap
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partitions. It does not work with swap files.
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Right now you may boot without resuming and then later resume but
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in meantime you cannot use those swap partitions/files which were
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involved in suspending. Also in this case there is a risk that buffers
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on disk won't match with saved ones.
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For more information take a look at <file:Documentation/power/swsusp.txt>.
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(For now, swsusp is incompatible with PAE aka HIGHMEM_64G on i386.
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we need identity mapping for resume to work, and that is trivial
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to get with 4MB pages, but less than trivial on PAE).
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config PM_STD_PARTITION
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string "Default resume partition"
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depends on SOFTWARE_SUSPEND
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default ""
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---help---
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The default resume partition is the partition that the suspend-
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to-disk implementation will look for a suspended disk image.
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The partition specified here will be different for almost every user.
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It should be a valid swap partition (at least for now) that is turned
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on before suspending.
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The partition specified can be overridden by specifying:
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resume=/dev/<other device>
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which will set the resume partition to the device specified.
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Note there is currently not a way to specify which device to save the
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suspended image to. It will simply pick the first available swap
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device.
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config SUSPEND_SMP
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bool
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depends on HOTPLUG_CPU && X86 && PM
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default y
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config APM_EMULATION
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tristate "Advanced Power Management Emulation"
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depends on PM && SYS_SUPPORTS_APM_EMULATION
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help
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APM is a BIOS specification for saving power using several different
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techniques. This is mostly useful for battery powered laptops with
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APM compliant BIOSes. If you say Y here, the system time will be
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reset after a RESUME operation, the /proc/apm device will provide
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battery status information, and user-space programs will receive
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notification of APM "events" (e.g. battery status change).
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In order to use APM, you will need supporting software. For location
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and more information, read <file:Documentation/pm.txt> and the
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Battery Powered Linux mini-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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This driver does not spin down disk drives (see the hdparm(8)
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manpage ("man 8 hdparm") for that), and it doesn't turn off
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VESA-compliant "green" monitors.
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Generally, if you don't have a battery in your machine, there isn't
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much point in using this driver and you should say N. If you get
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random kernel OOPSes or reboots that don't seem to be related to
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anything, try disabling/enabling this option (or disabling/enabling
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APM in your BIOS).
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