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Sixth mechanismSixth mechanismPosted Jun 1, 2011 9:34 UTC (Wed) by error27 (subscriber, #8346)In reply to: Sixth mechanism by pr1268 Parent article: Garrett: Rebooting
On my laptop (Samsung RV511) you have to hold the power key down for 10 seconds to trigger a power off. It works great unless the kernel is panicked, in which case you need to unplug and remove the battery.
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Sixth mechanism Posted Jun 1, 2011 10:34 UTC (Wed) by bk (guest, #25617) [Link]
My understanding is that the "long press power button for hard reset" is (or was) part of the original ITX power spec, and so *should* have nothing to do with software.
However I guess with mobile machines the behavior will vary, since on some level they are emulating ITX within firmware. A kernel lockup still shouldn't matter.
Sixth mechanism Posted Jun 1, 2011 13:15 UTC (Wed) by marcH (subscriber, #57642) [Link]
> On my laptop (Samsung RV511) you have to hold the power key down for 10 seconds to trigger a power off.
I have seen that working on every decently recent PC (not just laptops).
Sixth mechanism Posted Jun 1, 2011 20:04 UTC (Wed) by hitmark (guest, #34609) [Link]
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).
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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