![]() ![]() The minimum brightness step offered by the fn key adjustments is still way too bright, but the driver provides much finer grained control. I twiddle the driver controls because my T460 is very bright - wonderful during the day, but horrible at night. The xbacklight utility offers a convenient command line control for this, though on my system it doesn't seem to like to go below 1% brightness and goes straight to black. The details are somewhat driver and software specific, but your laptop should offer convenient Fn keys that make it easy, and the OS should have a simple display brightness slider. (If your laptop is still old enough to use APM control instead of ACPI or custom drivers, get off my lawn). On a laptop, the backlight is usually controlled by software. I look for dim backlights when I'm speccing out displays to buy. ![]() It really annoys me that displays have such a limited backlight intensity range, often artifically and arbitrarily limited, starting at eye-searing to "the power of a million suns". ![]() They can sometimes be modified, but otherwise your best bet is setting them to minimum backlight brightness and then living with changing pixel values to get them even dimmer. Doesn't go dim enough?Īll too many displays do have backlight control, but minimum brightness is still eye-searing. 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 Fake brightness controls on cheap displays I'm pretty outdated though, and the linked article claims that basic options like brightness and contrast are widely supported now. 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. ![]()
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