How to keep OpenWrt running when closing the laptop screen?

I installed OpenWrt on an old laptop, but the router stops working when I close the laptop screen. Please help, how can I keep the laptop running after closing the screen?

Thanks

Well this most likely to be a BIOS/UEFI setting but not OpenWrt I guess?

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If not in bios power settings you probably need to look for a apci setting/config in openwrt.

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Thank you for your help, I give up and plan to buy a router.