Hi guys, I noticed some warning in dmesg on this Laptop. Fn+right, Fn+left is BrightnessDown/Up and produce the following warning: acer_wmi: Unknown function number - 4 - 0 The brightness has some other issue on this Laptop but not sure who to blame on this. Probably amdgpu.? /sys/class/backlight/amdgpu_bl1/brightness <-> actual_brightness seems to mismatch. EG: when brightness is 0 actual_brightness is still 5140. Unplugging the AC gives the following warning: acer_wmi: Unknown function number - 8 - 0 When plugging the AC back I see; acer_wmi: Unknown function number - 8 - 1. I uploaded a dump of the acpi tables and dmidecode of the box. https://www.frugalware.org/~crazy/nitro5/ACPI https://www.frugalware.org/~crazy/nitro5/DMI Please let me know if you need any other informations. Best Regards, Gabriel C