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    SubjectRe: 2.4.22 APM problems with IBM Thinkpad's
    Ruben Puettmann writes:
    >
    > hy,
    >
    > cause many problems with acpi I try to get apm running on my ibm
    > thinkpad R40 ( 2722). But with 2.4.22-pre10 and 2.4.22-pre10-ac1.
    >
    > Problems which happend:
    >
    > apm -s don't work with radeonfb usb and so on see my mails on lkm the
    > last days
    >
    > If CONFIG_APM_DISPLAY_BLANK is Y the thinkpad freezed on blanking the
    > display

    This sounds like a well-known APM/local-APIC clash.

    Never ever use DISPLAY_BLANK if you also have SMP or UP_APIC.

    With APIC support enabled (SMP or UP_APIC), APM must be constrained:
    DISPLAY_BLANK off
    CPU_IDLE off
    built-in driver, not module

    This is because the apm driver does BIOS calls, and many BIOSen
    (including the code in graphics cards, e.g. all Radeons it seems)
    like to hang if a local APIC timer interrupt arrives.
    -
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