The brightness cannot be adjusted. The ALS(Ambient Light Sensor) does not work.
Have you updated Mac OS or Host for this operation?
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Check if the signal cable is connected properly. Reconnect the cable or reinsert the PC's graphics card.
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When using the monitor, pixilated spots (red, green, blue, white, or black) may appear on the screen. This is normal for an LCD screen. It is not an error, nor is it related
to the monitor's performance.
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The ambient light sensor operates in accordance with Mac OS. Some Mac OS doesn't support the display ALS(Ambient Light Sensor).
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You can also adjust the monitor brightness by controlling the menu or hot key of a host manually.