Monitor automatically dimming. BENQ XL2546. I tried with and without Dynamic brightness. Set contrast and brightness to 100%, confirmed that via power settings (set to high performance) that adaptive brightness is off.
รีวิว-Review] Benq Zowie XL2536 Dyac - GUMP.IN.TH
BenQ Has Announced the Zowie XL2546S Monitor
Benq LCD Zowie 24.5´´ Full HD LED Monitor Black | Techinn