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    Subject2.4.22 hangs upon echo > /proc/acpi/alarm
    Date
    ACPI version is 20031002

    Initial backtrace obtained with kdb:

    acpi_os_read_port+36
    acpi_hw_lowlevel_read+7b
    acpi_ev_gpe_detect+94
    acpi_ev_sci_xrupt_handler+3c
    acpi_irq+d
    handle_IRQ_event+31
    do_IRQ+72
    call_do_IRQ+5
    do_softirq+5a
    do_IRQ+a1
    proc_file_write+9b
    sys_write+be
    system_call+33

    Further stepping shows endless loop around:

    acpi_ev_gpe_detect+80
    acpi_hw_lowlevel_read
    acpi_os_read_port
    acpi_ut_get_region_name
    acpi_ut_debug_print
    acpi_ut_debug_print
    jmp acpi_ev_gpe_detect+80

    Debugging is compiled in, but no meesages go to dmesg

    How to enable acpi_ut_debug_print output?

    Regards
    Michael

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