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Old 07-29-2016, 12:50 PM   #1
Registered: Sep 2007
Location: In My Box
Distribution: Arch Linux
Posts: 423

Rep: Reputation: 33
[XORG issue ?] Little bit before powering off the PC, a previous "print screen" appears

Hello out there.

Some time now i have realized that when i run systemctl poweroff, seconds before the screen go black, it shows a past "print screen"

Let me explain it better.

Let's say that the first think i did after starting my PC was to listen a song at youtube. After that i closed the firefox and watched a movie. After the movie i opened libreoffice and wrote something.

At the end of the day, when i'm going to poweroff the PC, a picture, from let's say firefox with youtube, appears for some seconds (keep in mind that firefox is closed). It could not be only firefox but vlc or libreoffice too.

Today i decided to write about it to find out what is happening.

So, is there any place that these "images/screenshots" might be saved ? Could this place be the RAM ? And if there is such place isn't a little bit insecure ?

What if someone could grub them from RAM or wherever they are ?

Did this happen to anyone else ?
Old 07-29-2016, 02:15 PM   #2
Registered: Nov 2012
Posts: 213

Rep: Reputation: 78
I have a similar problem where I will sometimes see an image of my desktop randomly appear, though I don't notice it when I shut the PC down. I notice it most when I start up a full screen game and the game hasn't yet displayed anything - it has just changed the video mode. It seems like every time I start up CS:GO I see a slightly corrupt image of firefox complete with window decorations.

The data will be stored in your video memory, and when the video mode is changed the graphics card will just display whatever data is already there while it waits for the new program to start sending data - at least that's what I think is happening.

I also wondered about how secure this is, and whether programs like firefox should be displaying a completely black image as the last thing before they shut down to try and prevent it. What if I go to show a program to someone, and when starting up the program my old firefox windows are shown instead for a while

Last edited by af7567; 07-29-2016 at 02:19 PM.


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