Do not use these controls if you have such a monitor it's usually better to do the correction in software, certainly no worse. The brightness controls on the display just adjust the pixel values on the LCD, just like software control does. Some cheap displays don't support backlight control at all. Fake brightness controls on cheap displays I'm pretty outdated though, and the linked article claims that basic options like brightness and contrast are widely supported now.
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and even many of those use a USB connection and custom USB HID based driver instead of the DDC/CI standard. I've only seen it in very high end displays intended for calibrated photo and video work. Try the ddccontrol tool with your monitor and see if you have any luck.
There's a standard for it, DDC/CI but adoption has been limited. Last I checked, most displays unfortunately do(did?) not implement backlight control from software. Everything looks flatter.Ī tool like Redshift can be useful for changing colour balance, but as much as possible you should try to change brightness with backlight adjustment.
So instead of using pixel values from 0-255 it might use from 0-180 for example.
Software adjustment can't make the blacks darker, it just makes white greyer and reduces contrast. If you dim the backlight you still get full or near-full dynamic range, giving you a clearer, "deeper" image that tends to be more readable. First and most importantly, if at all possible adjust the display backlight, rather than using software correction of pixel values.