On Tuesday 31 October 2006 16:27, Ernst Herzberg wrote: > With 2.6.18.x everything works fine. > > But 2.16.19-rc does not boot if the laptop runs on battery _and_ lapic is > defined as boot parameter. > Local APIC disabled by BIOS -- you can enable it with "lapic" The BIOS is advising you here that it is a bad idea to enable the LAPIC on this system. So why are you using the "lapic" boot parameter? If you are running an CONFIG_SMP kernel with LAPIC enabled and deep C-states (such as are available on Thinkpads when on battery mode), you will run into the following bug: http://bugzilla.kernel.org/show_bug.cgi?id=7376 As this is not new, the mystery is really why you see no problems in 2.6.18. Perhaps you can forward the contents of /proc/interrupts for 2.6.18 with "lapic" and we can see if the timer and the LOC are in sync or not when on battery? /proc/acpi/processor/*/power will also tell us about the C-states -- dump it for both AC and battery mode. thanks, -Len - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
