Messages in this thread |  | | Subject | Re: Local APIC option (CONFIG_X86_UP_APIC) locks up Inspiron 8100 | Date | Wed, 31 Oct 2001 10:44:54 +0000 (GMT) | From | Alan Cox <> |
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> 2) Anytime I change the plugged-in status of the AC adapter (if it wasn't > plugged in, if I plug it in; if it was plugged in, if I unplug it), the > machine locks up completely.
Not all BIOS firmware can cope when we switch to UP-APIC. Some laptops really don't like it one bit.
> One other thing: how would the kernel react to the "SpeedStep" feature of > changing the CPU speed while things are still running?
Depends on the laptop. Speedstop is not documented by intel so either it works because the APM bios did the right thing, or it doesn't work because it didn't. The only kernel issue is delay loops. We calibrate them at boot and assume the base clock is constant. In practice this isnt showing up as a real problem, although we do need to switch to the ACPI timers on later laptops - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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