Why does laptop Wi-Fi disconnect when power is plugged in? Works fine on battery power

My mother-in-law has a Lenovo Yoga laptop running Windows 11 home. Her Wi-Fi works normally when running on battery power. The moment I plug in the AC adaptor, Wi-Fi stops working. Note that the laptop doesn't have an ethernet port, so I can't confirm whether the behavior also happens for wired internet. If I start a ping running in a shell, I can watch the pings connect or stall in real time as I plug and unplug the computer. I've tried basics like updating WLAN drivers, windows network settings reset , forgetting networks, etc. I can't see anything in ipconfig or other utilities to suggest w

Question by Benj on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.