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Advogato: How Linux Suspend and Resume Works in the ACPI Age

Feb 08, 2007, 05:30 (1 Talkback[s])

"Back in the APM days, everything was easy. You called an ioctl on /dev/apm, and the kernel made a BIOS call. After that, it was all up to the hardware. Sure, it never really worked properly, and it was basically impossible to debug what the hardware actually did. And then ACPI came along, and nothing worked at all. Several years later, we're almost back to where we were with APM. But what's actually happening when you hit that sleep key?

"Without the ability to suspend and resume, laptop users are doomed to spend several hours of their lives waiting for machines to boot and shutdown..."

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