Backlight and screen brightness not adjustable after suspend

Ask Fedora
,
1

I recently bought an Asus Vivobook S14 (Core Ultra 5 225H) ASUS Vivobook S14 – More Intelligent, More Productive, More

It has a Realtek RTL8852BE, the wifi does not work out of the box, when I close the lid of the laptop, the laptop suspends, however when resuming use the wifi never comes back.

From what I have researched, there are a few solutions:

  1. Install a driver provided on github (I cant get this to work)
  2. set kernel flag mem_sleep_default=deep, which resolves the suspend issue, and seems to make the battery bleed less when it is suspended(?)
  3. Add a kernel flag to disable low power mode on the laptop, which seems counter productive.

I have opted for option 2, which seems like a win-win situation, however setting this flag comes with it’s own issues…

When mem_sleep_default=deep is in place, and the system is resumed, i can no longer set the display(from the keyboard fn keys) or keyboard brightness(at all), and the keyboard backlight fades from dim to bright like it does when it the laptop switches on initially.

Has anyone come across this issue and resolved it?

2

Getting closer to a solution, on restoring from suspend typing

sudo rmmod asus_nb_wmi && sudo modprobe asus_nb_wmi reset=1

stops the keyboard from flashing, however you cant set the keyboard backlight from the keyboard or from the panel in gnome

however if i input a value in /sys/class/leds/asus::kbd_backlight/brightness, it works, the brightness changes, now it feels like it could also be a gnome issue…

1 Like