How to Fix American Truck Simulator on ROG Ally in 3 Steps
Step 1 - Go To Documents/American Truck Simulator/ then open config.cfg

2 - Change Two Settings

Replace the 1's in these string of text:
uset cf_asus_aura "1"
uset cf_razer_chroma "1"
to 0s
uset cf_asus_aura "0"
uset cf_razer_chroma "0"
Step 3 - Launch The Game

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