https://addons.opera.com/en-gb/extensions/details/backlights-bleed-test/
You can conduct a backlight bleed test by opening a pitch-black image, playing a full-screen video, or using our advanced tool.
add onsbacklightsbleedtestextension
https://addons.opera.com/tr/extensions/details/backlights-bleed-test/
You can conduct a backlight bleed test by opening a pitch-black image, playing a full-screen video, or using our advanced tool.
backlightsbleedtestopera
https://www.tek.com/de/support/faqs/does-turning-tps2000-front-panel-backlights-make-batteries-last-longer
Does turning off the TPS2000 front-panel backlights make the batteries last longer?
front panelturningbacklightsmake