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I am running a fresh install of Ubuntu 12.10 with Cinnamon,

after roughly 10 minutes the screen turns black. I have set "Turn screen off when inactive for:" to "Never" or tried high values (1h +), this does not affect this behaviour. In the dconf-editor I located following entries:


setting to 0 did not have any effect


unsetting/unchecking did not have the desired effect


setting it to 0 or very high values (100k) did not have any effect.

do you have any suggestions on how to approach this issue? cheers peter

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Cinnamon uses Gnome 3, whereas I believe the system settings you are altering are for compiz/Unity. I think Gnome still uses the power settings for things like screen blanking so you might want to investigate that. – fabricator4 Nov 10 '12 at 21:53

Using the GUI look for "Preferences > Brightness and Lock". Or run


then choose "Brightness and Lock".

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The GUI "Brightness and Lock" did have no effect on the problem in cinnamon. (As mentioned above - albeit not as clearly as I could have) Nor did the settings in ... plugins/power or session. – peter Nov 13 '12 at 8:56
That's a pity. It definitely works for me, using Cinnamon 1.6.6 on Ubuntu 12.04. – xebeche Nov 13 '12 at 9:08
up vote 1 down vote accepted

I found a dirty workaround in some fedora forum.

  1. install the package xscreensaver
  2. set the screensaver to run after minutes of inactivity=0 (i.e., never)
  3. add the screensaver to the startup applications /usr/bin/xscreensaver -no-splash

this worked in cinnamon.

the other approaches mentioned above only worked with unity

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Easiest way to disable screen blanking is to remove the Gnome screensaver by issuing this command:

sudo apt-get remove gnome-screensaver
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Unfortunately I lack sufficient reputation to comment or vote up/down, but I can apparently give a separate answer--go figure. Summary: the only fix that WFM was xscreensaver. Details:

My own experience, today, with my GF's ubuntu 12.10 with cinnamon, was as follows:

  1. In the past I had disabled screen blanking on inactivity by using dconf-editor to unset the proper key. I forget the name of that key :-) but it was something like the org.gnome.desktop.applications.screensaver.idle-activation-enabled
  2. This week, I installed the updates requested by Software Updater, which I noticed included cinnamon packages. GF then complained that web videos went black after 10 minutes play.
  3. I applied my previous fix with dconf-editor, restarted (just in case :-), and played video: no fix. I tried a few other dconf-editor hacks: all failed (with increasing irritation).
  4. DuckDuckGo delivered me to this page.
  5. I tried setting mainmenu>Preferences>Brightness and Lock appropriately, restarted (JIC), and played video: no fix.
  6. I tried uninstalling gnome-screensaver): it was not installed. Instead I uninstalled cinnamon-screensaver, restarted (JIC), and played video: no fix.
  7. I thought the xscreensaver answer sounded pretty dubious, but tried it anyway: installed, restarted, configured (via mainmenu>Preferences>Screensaver), and played video: it worked! Hour video stream played without blanking. Thank you, peter.
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