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I have an AOC Intl monitor, 23 inch, resolution 1920x1080, that connects to the computer via HDMI cable. It works as well on my desktop with Ubuntu 18.04 and Windows 10 dual boot.

And for both OSes, I got the same strange behavior: when I turn on the (only) neon light in my room, the monitor is always automatically becoming black within a few seconds. It looks like it activates some self-regulating mechanism. After that, it will restore normal state.

When I turn off the light, the same thing also happens.

And that happens even in daylight.

aoc display

What's that feature? How to disable it? How to keep the monitor always-on without modifying its state like that?

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    Sounds like interference from the fluorescent light. How is the monitor connected to the computer? HDMI? I have a TV at home that does the same thing. Any electrical noise causes it to lose sync and blink out for a couple seconds. You can try a different HDMI cable. Or maybe move the monitor to a different electrical outlet or further away from the fluorescent light. You need to do some troubleshooting. I don’t think this has any thing to do with a “feature.” You may have to just live with it or buy a different monitor.
    – Appleoddity
    Sep 1, 2018 at 15:06
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    That sounds like the feature for an ambient light sensor on the PC/monitor, however I'm not sure how to disable it on Ubuntu (in Windows, it's within the Power Control Panel applet)
    – JW0914
    Sep 1, 2018 at 15:07
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    I'm with @appleodditty for this. Change the lamp, or put a ferrite bead on the monitor power cable.
    – xenoid
    Sep 1, 2018 at 16:06
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    Switch off ambient light sensor if it turned on in power options
    – Alex
    Sep 1, 2018 at 16:21
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    ambient light sensor can be also activated in BIOS
    – Alex
    Sep 1, 2018 at 16:30

1 Answer 1

Reset to default
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Maybe your spike guard is the culprit. Even my screen blinked for the last 4 years while i someone switch on fan or light. I thought it was hdmi to dvi converter which caused the screen to go off. But the thing is that hdmi and dvi have the same signals and the only difference is hdmi cables transfer sound signals also if you have speaker in your monitor. So the convertor was not the problem as it is just an extention without an adapter. My monitor dosen’t have a hdmi port thats y i used a convertor. Yesterday i bought a good quality spike guard from GM modulars company on amazon and now my screen dosent go off. Also the culprit may be cheap hdmi cables. buy good quality hdmi cables and spike guard.

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