Software :: Gnome Screen-saver Does Not Turn On When System Is Idle - FC-11

My Gnome screensaver doesn't work, although it once did.

I have searched for a solution to this problem but no luck. I am running FC 11 and out-of-the-box gnome. At first the screensaver worked normally, shutting off the screen after 5 mins. Now it does not do so. I found the following command line suggestion in the forums, and it looks like it may point to a problem -- the screensaver is inactive, but how to make it active? I may be misunderstanding the term inactive, of course. Logically, the screensaver would have to be inactive if I am typing a command.

In any case, the query command shows:

Just in case the screensaver really was not running, I tried this command (which I found in another post):

But the query returns the same thing as before.

The only thing I can think of that might be an issue is that using the "appearances" background facility I added a couple dozen pictures that I thought I might use as screen background. Not long after that I discovered that my screen did not go black after 5 mins as expected. Not sure this correlation has any causal meaning, however. I then tried various things, finally returning to the plain (blue) default. That seemed to fix it for a short while, then after a couple of days, the bad or non-behavior returned -- the screensaver does not work.

(update -- I removed all the extra background pics and it makes no difference.)

My system runs all the time, but I don't want the screen to be on all the time.