Hmm... maybe it has something to do with ACPI ? Could you try booting the
kernel after a warm reboot with ACPI disabled ?
An other thing I can think about is that a driver does odd things due to the
fact that the hardware isn't reinitialized completely. See dmesg what driver
comes after that serial driver and disable the serial driver and / or the
other driver. See if this helps.
Jos
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