Light blue screen on primary monitor when waking up from inactivity

Bug #998735 reported by Slankbakfra
This bug affects 15 people
Affects Status Importance Assigned to Milestone
mutter (Ubuntu)

Bug Description

I have configured ubuntu to turn of screen after 10 minutes of inactivity. When I wake up computer the external primary screen is light blue and the laptop-screen is black and displaying my usename at the top right corner.

I use Ubuntu 12.04 with propitary Nvidia drivers. I also use GDM and gnome-shell (Gnome 3). I use a external monitor as primary screen and laptop-screen as secondary. Both resolution is 1920x1200. Laptop is Dell XPS M1530.

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Ubuntu Foundations Team Bug Bot (crichton) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit and add the package name in the text box next to the word Package.

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tags: added: bot-comment
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Slankbakfra (fholmer) wrote :

According to the gnome-power-manager package is most likely to cause the bug.

affects: ubuntu → gnome-power-manager (Ubuntu)
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in gnome-power-manager (Ubuntu):
status: New → Confirmed
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Bryan (watermark86) wrote :

This issue has gone away for me. Same for everyone else?

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Margarita Manterola (marga-9) wrote :


I'm affected by this bug, but only when using cinnamon, not unity. Something was done in compiz to prevent this problem but this was not done in muffin/mutter.

I've found out that when using xscreensaver the issue happens as well, BUT when moving the mouse xscreensaver's password prompt shows up (with black background), and then goes away and blue comes back when the timeout expires, that sounds like some X buffer is turning blue, and xscreensaver is successful in overwriting it, while gnome-screensaver isn't.

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lumbricus (lumbricus) wrote :

I had the same issue with 12.04 and nvidea drivers. I even downloaded the Gnome Live image to report it as upstream bug. I think there was a bug in gnome-screensaver. But now after installing 12.10 the bug disappeared.

Revision history for this message
Margarita Manterola (marga-9) wrote :

The bug is in mutter and muffin (which is a fork of mutter).

The upstream bug where it was finally fixed:

I'm attaching here the patch that fixes the problem for mutter.

affects: gnome-power-manager (Ubuntu) → mutter (Ubuntu)
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "Patch fixing blue screen bug for mutter" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags: added: patch
Changed in mutter:
importance: Unknown → Medium
status: Unknown → New
Changed in mutter:
status: New → Confirmed
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