dpms setting does not get overriden by screen

[Mio]

all options (including never) in screen for turning off the screen after more than 10 min don't work: the screen turns off after 10 min.
this is because "the dpms setting which does not get overriden by anything for some reason - see "xset q" output"
see also https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/841345/comments/8 and https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/841345/comments/10

[Mio (m10)]

$ xset q
Keyboard Control:
  auto repeat: on key click percent: 0 LED mask: 00000000
  XKB indicators:
    00: Caps Lock: off 01: Num Lock: off 02: Scroll Lock: off
    03: Compose: off 04: Kana: off 05: Sleep: off
    06: Suspend: off 07: Mute: off 08: Misc: off
    09: Mail: off 10: Charging: off 11: Shift Lock: off
    12: Group 2: off 13: Mouse Keys: off
  auto repeat delay: 500 repeat rate: 33
  auto repeating keys: 00ffffffdffffbbf
                        fadfffefffedffff
                        9fffffffffffffff
                        fff7ffffffffffff
  bell percent: 50 bell pitch: 400 bell duration: 100
Pointer Control:
  acceleration: 1/1 threshold: 4
Screen Saver:
  prefer blanking: yes allow exposures: yes
  timeout: 600 cycle: 600
Colors:
  default colormap: 0x20 BlackPixel: 0 WhitePixel: 16777215
Font Path:
  /usr/share/fonts/X11/misc,/usr/share/fonts/X11/Type1,/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType,built-ins
DPMS (Energy Star):
  Standby: 0 Suspend: 0 Off: 0
  DPMS is Enabled
  Monitor is On

[Mio (m10)]

$ lspci |grep nVidia
01:00.0 VGA compatible controller: nVidia Corporation G86 [GeForce 8600M GS] (rev a1)

[Mio (m10)]

using proprietary nvidia driver

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.