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I can change the background image that LightDM displays, but regardless of the image I choose, it's overlaid with a grid of dots. The dots look OK on the default background, but they look horrible on the background I want to use. How can I get rid of them? There don't appear to be any relevant options in any of the files in /etc/lightdm.

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5 Answers

up vote 5 down vote accepted

For 12.04

Try the following commands in a terminal. It should work. 

sudo xhost +SI:localuser:lightdm
sudo su lightdm -s /bin/bash
gsettings set com.canonical.unity-greeter draw-grid false
exit

References:

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+1 for giving the correct answer for 12.04. I'd remove the second exit though, it assumes that you opened a terminal just for this sequence of statements and want to close it again. – nem75 Apr 22 at 10:40
@nem75 Thanks. Sorted it out. – jokerdino Apr 22 at 11:19
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up vote 12 down vote

In 12.04 and later it now supports enabling/disabling of the dots. Edit /etc/lightdm/unity-greeter.conf and add:

draw-grid=false
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This was this bug: bugs.launchpad.net/unity-greeter/+bug/883908. – Scott Severance Jan 19 at 16:19
I commented in the bug report that the released fix does not work for me. WhetherUsing dconf or appending draw-grid = false in unity-greeter.conf I hope i am not the only one :( – Hanynowsky Apr 9 at 1:33
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For 12.04 and the latest unity-greeter, the conf file won't work. This is the right answer. – Chan-Ho Suh Apr 14 at 2:30
For a fresh 12.04 install this, as mentioned, is the wrong answer. As soon as 12.04 is released it should no longer be flagged as the correct answer - or edited. The right answer, as Chan-Ho Suh pointed out, is here. – nem75 Apr 22 at 10:37
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up vote 11 down vote

Thanks to @Blitz and @Zoke for their answers. However, I've created a more complete solution. I've modified the package unity-greeter to remove the dots and I've packaged it in a PPA.

Anyone who wants to be rid of the dots can use my PPA. Here are instructions:

  1. Add the PPA:

    sudo add-apt-repository ppa:scott.severance/lightdm

  2. Run sudo apt-get update

  3. Run sudo apt-get upgrade
  4. The dots are now gone.
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Nice work thanks for sharing – Blitz Oct 30 '11 at 14:56
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If you downvote, please explain why. – Scott Severance Jan 19 at 16:23
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Presumably because forking unity-greeter is overkill, and relying on a PPA to maintain an important package (even if unity-greeter is mainly just configuration) is not ideal. And there is a much simpler configuration-only solution. – neon_overload Apr 22 at 12:37
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@mmj: At the time this was posted, it was the only way. I filed a bug containing my patch which was accepted upstream. Now, upstream has changed the way they handle configuration. I fail tosee how my solution was o erkill – Scott Severance Apr 22 at 13:35
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up vote 3 down vote

It is hard coded in the sources. I have disabled it on my install by making a small change in the source of user-list.vala.

A quick step by step guide.

sudo apt-get install build-essential
apt-get source unity-greeter
sudo apt-get build-dep unity-greeter
cd unity-greeter-0.1.1/src/
vim user-list.vala +252

Remove the line or just add // at the beginning of the line. Save and exit.

cd ..
dpkg-buildpackage -rfakeroot -uc -b
cd ..
sudo dpkg -i unity-greeter_0.1.1-0ubuntu1_*.deb

Ubuntu will try to replace the custom built package when performing a system upgrade. Just uncheck unity-greeter to keep the custom one or reinstall the custom one using 'dpkg' after the upgrade.

[Edit]

To prevent the package manager from replacing your custom unity-greeter just run

sudo apt-mark hold unity-greeter
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Thanks for your answer. As you were posting, I was working on this, also. I've now posted the result in a PPA, as explained in my answer. Had I not been working on a more complete solution, I would have accepted your answer. – Scott Severance Oct 30 '11 at 9:51
No problem. A more permanent solution is always welcome. After all not all of us are comfortable working with source code. – Zoke Oct 30 '11 at 12:19
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up vote 2 down vote

At the moment at least this is not currently possible. I have done some reading around before and it seems to be hard coded in. Hopefully the devs will include a way to get rid of them eventually.

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Your answer spurred me to examine the source. The grid is in fact hard coded in the file src/user-list.vala. Line 233 is the most interesting. If I get time, perhaps I'll turn the alpha all the way down and make a .deb with the modifictions. – Scott Severance Oct 27 '11 at 4:20
It is possible in 12.04 via gconf settings. – nem75 Apr 22 at 10:41
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