Improved ways to suspend and hibernate a laptop under Linux
Last June I wrote about suspending and hibernating laptops under Linux. Since then a few things have changed -- thankfully, for the better -- so it's time to revisit the subject. Also, a few readers have responded offering suggestions for improving the suspend shell script I wrote back then, and I've incorporated these suggestions in a new version; unfortunately most of the comments are anonymous, so I can't give proper credit to their authors.
The most important change since the last article is that laptops with multi-core CPUs are now the de facto standard. Intel Core Duo and Core2 Duo processors not only offer Symmetric Multiprocessing (SMP) functionality to mobile users but also consume less power, and thus produce less heat, than their predecessors.
These new multi-core CPUs are supported by the Linux kernel, but you need a fairly recent version to fully utilize them in SMP mode. Suspend-to-RAM with SMP enabled works in kernel versions 2.6.18 onwards, but it's not 100% stable with occasional crashes on resume. Another problem I faced on a Core Duo system is the occasional miscalculation of the remaining battery life.
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