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Sixth mechanismSixth mechanismPosted Jun 1, 2011 20:04 UTC (Wed) by hitmark (guest, #34609)In reply to: Sixth mechanism by marcH Parent article: Garrett: Rebooting
Yep, it is part of the change from AT (power button wired directly to the PSU) to ATX (power button as a "short" on the motherboard that then signals the PSU).
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Sixth mechanism Posted Jun 1, 2011 20:48 UTC (Wed) by mjg59 (subscriber, #23239) [Link]
The behaviour then became embodied in the ACPI spec (holding the power button for more than 4 seconds is supposed to transition into G2), but on modern laptops this is usually managed by the embedded controller rather than the switch being inlined with the PSU or battery in any way. And, inevitably, various vendors get this wrong. I've got a Vaio that won't turn off if you oops, because every time the EC blinks the LEDs it forgets the power button state and so doesn't think it's been pressed for long enough.
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