Help wanted: ACPI and serial ports

Hi everybody,

I'm facing a weird problem with a motheboard from http://www.flytech.com/product-18.html / B79 model.

I'm using a 2.4.22 kernel.

The PC must power off once a day and then restarts some hours after using the RTC Power On bios feature.
Problem: if RTC Power On is up, PC never stops (it reboots immediately after the power off call). If I turn off RTC power on feature, the PC stops and power is off. Looking at dmesg, I see ACPI: Interpreter disabled.

So I tried to set acpi=force on kernel's command line: curiously, the kernel loads a asus_acpi module.
Problem: if asus_acpi is loaded, and RTC Power On is up, the PC never stops. If a remove the module, that's OK: the PC stops and power is off.

Seeems to be OK, no ?

The PC uses 4 serial ports: if I set acpi=force, I can't use serial port 3 and 4 anymore, even using setserial call.

Is there something I can do to track the problem ?

Regards,

jean-françois

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