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I have a laptop with 4GB of RAM and only 3.5GB used to be detected. I recompile the kernel with the option High memory (64GB) enabled and now 3.96 GB of RAM is detected. The High Memory (64GB) option is under “Processor type and features” -> “High Memory Support (64GB)".
PS: you can find a good tutorial about compiling your own kernel at http://alien.slackbook.org/dokuwiki/...kernelbuilding