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Software Suspend 2, also called "swsusp2" and "suspend2", is an implementation of suspend-to-disk functionality in the form of a Linux kernel patch and several userspace utilities. It is an alternative to both the BIOS-driven hibernation feature found on most ThinkPad models, and the "software suspend" functionality built into recent Linux kernels. | Software Suspend 2, also called "swsusp2" and "suspend2", is an implementation of suspend-to-disk functionality in the form of a Linux kernel patch and several userspace utilities. It is an alternative to both the BIOS-driven hibernation feature found on most ThinkPad models, and the "software suspend" functionality built into recent Linux kernels. | ||
| − | Compared to the alternatives, Software Suspend 2 has some unique features: | + | Compared to the alternatives, Software Suspend 2 has some unique [http://suspend2.net/features features]: |
* The ability to compress the memory image as it is written to disk, thereby reducing suspend and resume times. | * The ability to compress the memory image as it is written to disk, thereby reducing suspend and resume times. | ||
| − | * Saving the memory image | + | * Saving the memory image into the swap partition or a file on a normal filesystem, instead of a dedicated partition |
* Cancelling a suspend in progress | * Cancelling a suspend in progress | ||
* Control over amount of RAM written to disk -- can (optionally) discard cached disk blocks to reduce suspend and resume times | * Control over amount of RAM written to disk -- can (optionally) discard cached disk blocks to reduce suspend and resume times | ||
* Textual and graphical UI (optional) | * Textual and graphical UI (optional) | ||
| − | * Improved reliability under some circumstances | + | * Improved reliability under some circumstances -- if the alternatives don't work, try this one! |
Since it is implemented purely in software, Software Suspend 2 is in principle machine-independent and should work on all modern ThinkPad models. However, in some cases problematic driver need to be unloaded before suspension. | Since it is implemented purely in software, Software Suspend 2 is in principle machine-independent and should work on all modern ThinkPad models. However, in some cases problematic driver need to be unloaded before suspension. | ||
Revision as of 03:11, 10 November 2005
General
Software Suspend 2, also called "swsusp2" and "suspend2", is an implementation of suspend-to-disk functionality in the form of a Linux kernel patch and several userspace utilities. It is an alternative to both the BIOS-driven hibernation feature found on most ThinkPad models, and the "software suspend" functionality built into recent Linux kernels.
Compared to the alternatives, Software Suspend 2 has some unique features:
- The ability to compress the memory image as it is written to disk, thereby reducing suspend and resume times.
- Saving the memory image into the swap partition or a file on a normal filesystem, instead of a dedicated partition
- Cancelling a suspend in progress
- Control over amount of RAM written to disk -- can (optionally) discard cached disk blocks to reduce suspend and resume times
- Textual and graphical UI (optional)
- Improved reliability under some circumstances -- if the alternatives don't work, try this one!
Since it is implemented purely in software, Software Suspend 2 is in principle machine-independent and should work on all modern ThinkPad models. However, in some cases problematic driver need to be unloaded before suspension.
Model-specific Status
- ThinkPad T43: works once SATA resume patch is applied and the SATA drivers are made built-in or put in initrd; see Problems with SATA and Linux
- ThinkPad X22: works; see Installing Ubuntu (Breezy) on a ThinkPad X22
Installation Instructions
The project home page has a detailed HOWTO and FAQ.
External links
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