Power Saving for the Workstation, Part 2 - page 4
Automatically Suspending to RAM
If the preceeding method doesn't work for you, and you have the right kernel functions built in, installing the programs (uswsusp/swsusp) via Debian aptitude might work, but watch carefully what aptitude or apt-get might tell you about packages it wants to remove.
If the method described here fails, Tux-on-Ice (formerly called suspend2, name changeover still in progress) provides a special kernel module to facilitate suspend/hibernate. You'll have to rebuild the kernel to make it work. For more information, go to the site, they have extensive documentation and a mailing list. There will also be a replacement suspend (PM_SUSPEND) built into kernel versions 2.6.21+, this may work better for you.
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YahooBuzzNote that there are two competing developer groups and suspend/hibernate implementations at this point. The biggest difference for the user is that the suspend software from the Tux-on-ice has to be separately downloaded and compiled by the user into a custom kernel. SOFTWARE_SUSPEND and soon, PM_SUSPEND are built-in.
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