Please tell us some basic information before asking for help:
Model Name: ROG Phone 5
Firmware Version: 18.0830.2101.81
Rooted or not: NO
Frequency of Occurrence: After latest update
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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DC dimming doesn't work under 120Hz and 144Hz. Just another advertise scam, huh?