Keyboard backlight turned on during sleep

Hi, I just tried “Sleep” (suspend to RAM), which hasn’t worked for me at all for a long time.
Now it seems to work, but when the screen gets turned off, the keyboard’s backlight turns on. And stays on while asleep. Which is extremely annoying. When you press a button, the laptop wakes up and all is fine. Any ideas how to turn them off?
I’m with 5.15.27-xanmod1-MANJARO and I’ll provide more info if requested. The only error I see in dmesg is “ucsi_acpi USBC000:00: PPM init failed (-110)”.