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I was trying to change my lockscreen wallpaper because the inbuilt feature didn't work. I searched and found a solution of this. Edit line 1814 in

sudo -H gedit /etc/alternatives/gdm3.css

to

#lockDialogGroup {
  background: #2c001e url(file://{file location});
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center; }

This works, but not in every situation. I have 2 .jpg files file 1 is 108.5kB and file 2 is 9.5kB, both located in the same directory. With file 1, the lockscreen changes when I log out after logging in(turn on -> login(Isn't changed) -> log out(it's changed)). With file 2, both works fine.
So the question is
1. Is there a maximum file size limit or a maximum resolution for the lockscreen.(file 1 works fine for normal wallpaper)
2. What is the solution for this? Is there a way to scale the image like object-fit in css?

ps. The file I want to use is file 1. I tested file 2 to check if the method is valid.

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  • I spent a half hour searching and couldn't find anything. Perhaps open file1.jpg in gimp (or another image editor / converter) and export it as file1.png to see if that works better?
    – WinEunuuchs2Unix
    Oct 14, 2019 at 16:57
  • @WinEunuuchs2Unix After reading your comment I converted the file to .png and know it works. Thank you! But why is this happening? I think it's because some body who uploaded the image changed the original png file to jpg. But its a little awkward because in windows everything worked fine even if I changed from jpg to png and vice versa.
    – Moses Kim
    Oct 14, 2019 at 17:13
  • I posted an answer showing how the problem was solved. As a new user please be advised you need to click the grey check mark next to the answer so others know the solution. As for how and why the problem happened I put that into the answer but it is only a guess as we can't see the actual file.
    – WinEunuuchs2Unix
    Oct 14, 2019 at 17:25

1 Answer 1

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As suggested in comments, converting .jpg to a .png file fixed the issue.

.png is a more native file format for Linux and .jpg is a more native file format for Windows. That said the file conversion software may have removed "noise" from the .jpg file when converting it to .png format. If there was "noise" what it was is anyone's guess. If you are in a similar situation and you must have .jpg file format you can still convert it to another .jpg file with a bit of file compression and may also be successful.

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