Messages in this thread | | | From | "Grover, Andrew" <> | Subject | RE: Lid support for ACPI | Date | Sun, 29 Apr 2001 22:00:05 -0700 |
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(btw ACPI 2.0 spec section 12.1.1 discusses this)
> From: Pavel Machek [mailto:pavel@suse.cz] > > No, the ACPI standard requires CPUs to shut themselves down before > > any damage would occur from overheading. Well, at least the 1.0b > > version of the standard did; I haven't read 2.0 yet.
> BTW shut themselves down to halt, or shut themselves to > *very* low speed?
Both. When a CPU overheats, the OS implements either active (turning on a fan) or passive (cpu throttling). If the temperature still exceeds the critical threshold, the OS must shut down.
> Slow down to 10% speed is what my toshiba does. Is there way > back from such > mode?
Once the temperature drops below the active and passive cooling thresholds, the OS should stop its cooling measures, such as throttling.
That said, I seem to recall your laptop is doing throttling in a non-OS visible way (BIOS) so I don't know under what circumstances it stops cpu throttling.
Regards -- Andy
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