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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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