Re: [PATCH] i386: add command line option "local_apic_timer_c2_ok"

Pavel Machek
2007-03-26T12:31:59Z

Hi!

> It turned out that it is almost impossible to trust ACPI, BIOS & Co.
> regarding the C states. This was the reason to switch the local apic
> timer off in C2 state already. OTOH there are sane and well behaving
> systems, which get punished by that decision.
>
> Allow the user to confirm that the local apic timer is trustworthy in C2
> state. This keeps the default behaviour on the safe side.
...
> @@ -780,6 +780,9 @@ and is between 256 and 4096 characters. It is defined in the file
> lapic [IA-32,APIC] Enable the local APIC even if BIOS
> disabled it.
>
> + lapic_timer_c2_ok [IA-32,APIC] trust the local apic timer in
> + C2 power state.
> +

Could you add comment saying that this is always ok on non-broken
systems? That way perhaps it can be added to linux-firmware-test-cd,
etc.

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