TuxOnIce

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; requires SATA resume patch and the SATA drivers compiled as built-in or in initrd (see Problems with SATA and Linux)
• ThinkPad T21: works; need to unload the sound module (snd-cs46xx) on suspend
• ThinkPad X41 Tablet: works; requires SATA resume patch and the SATA drivers compiled as built-in or in initrd (see Problems with SATA and Linux) and a hibernate.conf fix (see Installing Fedora Core 4 on a ThinkPad X41 Tablet)
• ThinkPad X22: works (see Installing Ubuntu (Breezy) on a ThinkPad X22)
• ThinkPad G41: works (see Installing Debian on a ThinkPad G41)

Installation Instructions

The project home page has a detailed HOWTO and FAQ.

External links

• Project home page