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el_gallo_azul
Asked: 2016-10-22 15:59:40 +0800 CST

Ubuntu 16.04 - Dark patch on monitor (disappears on reboot)

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This has been happening for a while. AFAICR, it didn't happen before I upgraded from 14.04 to 16.04.

I will be using my computer for a while, and then I'll notice a dark patch that stays in the same location on my screen. It lloks like a 'burnt' patch on a CRT monitor.

The only way that I can get rid of it is to reboot the computer.

The location of the dark patch is in a slightly different location, and has a different size, each time it appears. It is always a rectangle.

I have never noticed which window was previously of that same size and in that same location.

I attach a screenshot - I didn't know until I looked at this screenshot whether the dark patch would appear on a screenshot. The dark patch in this screenshot appears superimposed over the text below the search text entry field.

While fiddling around switching between windows while getting and looking at the screenshot, and entering text here at AskUbuntu, I just noticed that the dark patch is no longer there, and I didn't have to reboot.

Screenshot of dark patch

16.04

1 Answers

  1. Best Answer

    On further reflection, and due to something that I just did, I think this might be happening when I Shift-PrtScr to get a screenshot of something, and then navigate to another window (eg. having used Copy to Clipboard in order to then paste the screenshot into another application).

    The dark rectangle represents the area that I captured in my screenshot in one application window, and it remains in the foreground on my monitor as long as the PrtScr window is still open.

    That's what caused it to happen just now, anyway.

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