[coreboot] M2v-mx_se asus : nvram reset on power unplug

Hello,

When I shutdown my computer, my nvram datas are kept alive. But if I unplug/plug the power supply, nvram is reset.
The clock is OK, so it is not a battery problem.

How can I keep datas in nvram when I unplug the power supply ?

Thanks in advance for your help.

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