Bug 849607

Description of problem:
I have always had my computer set to blank screen after 10 minutes. This is still being shown as 10 minutes when I do 'user name' (top right corner) -> system settings -> brightness and lock.

But underneath, running 'xset q':

soon after log in, it shows: 

Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  600    cycle:  600

DPMS (Energy Star):
  Standby: 0    Suspend: 0    Off: 0
  DPMS is Enabled
  Monitor is On

But then the timeout and cycle changes to zero; and the screen never goes to sleep.

I leave a mount of applications running all the time but expect my screen to switch off after a while. this is not working in the last few week.

I tried 'xset dpms 10 10 10', or 60 60 60, or have the screensaver blanking right away and it does turn off, but then it wakes up again after a while on its own, untouched; and I would find the values reset to zero again. same with the screensaver values.

Version-Release number of selected component (if applicable):
upower-0.9.17-1.fc17.x86_64

How reproducible:
always.

Steps to Reproduce:
1.
2.
3.
  
Actual results:
screen does not blank on its own.

Expected results:
screen goes blank after 10 minutes of inactivity.

Additional info:
I have not changed how I use my computer at all; this problem is new in the last few week. The closest I can think of is upowerd, but it may be another party - please feel free to re-assign. The system is in gnome 3.4 fallback mode.

I cannot figure out what component is periodically overwriting the screensaver/dpms values to zero.  I have tried setting them to 10, 60, 600 - 600 being 10 minutes as I have configured in the GUI - but the setting don't last - e.g. screen blank then wake  up by itself after a while, or screensaver blank then unblank and xset q keep showing those values being reset to zero after a while.

As I say, this problem is ony a few weeks old. I keep my system up to date f17.