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After updating from Ubuntu 12.04 Precise to Ubuntu 12.10 Quantal, X11
has started automatically blanking the screen after 10 minutes of
inactivity even though I have set "Turn off screen when inactive" in
"Brightness and Lock" to 1 hour.

If I change "Turn off screen when inactive" to 1 minute, then the screen
turns off after 1 minute as it should, but if I set it back to 1 hour
then the screen goes back to blanking after 10 minutes, not turning off
after 1 hour as it should. So it seems that there are two independent
timers and the GUI has no effect on the 10 minute one.

Looking in xset, there is indeed a 10-minute screen blanking timeout.

$ xset q
Keyboard Control:
  auto repeat:  on    key click percent:  0    LED mask:  00002000
  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:  on 
  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:  2/1    threshold:  4
Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  600    cycle:  600
Colors:
  default colormap:  0x20    BlackPixel:  0x0    WhitePixel:  0xffffff
Font Path:
  /usr/share/fonts/X11/misc,/usr/share/fonts/X11/100dpi/:unscaled,/usr/share/fonts/X11/75dpi/:unscaled,/usr/share/fonts/X11/Type1,/usr/share/fonts/X11/100dpi,/usr/share/fonts/X11/75dpi,/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
$

Note that I am using a dual head configuration so I have an xorg0.conf
and an xorg1.conf, but there is nothing in either related to screen
blanking. Both heads experience the same problem. My other machine that
I upgraded from 12.04 to 12.10 does not.

Running "xset s 0 0" avoids the problem.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: xserver-xorg-core 2:1.13.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.gpus.1: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/1'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.43  Sun Aug 19 20:14:03 PDT 2012
 GCC version:  gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1)
.tmp.unity.support.test.0:
 
.tmp.unity.support.test.1:
 
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,grid,imgpng,gnomecompat,move,place,regex,resize,snap,animation,vpswitch,session,mousepoll,unitymtgrabhandles,compiztoolbox,wall,expo,workarounds,ezoom,fade,scale,unityshell]
CompositorRunning: compiz
Date: Sun Oct 28 19:41:51 2012
DistUpgraded: 2012-10-28 10:39:13,985 DEBUG enabling apt cron job
DistroCodename: quantal
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 304.43, 3.2.0-32-generic, x86_64: installed
 nvidia-current, 304.43, 3.5.0-18-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 NVIDIA Corporation GF110 [GeForce GTX 570] [10de:1081] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: eVga.com. Corp. Device [3842:1570]
 NVIDIA Corporation GF110 [GeForce GTX 570] [10de:1081] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: eVga.com. Corp. Device [3842:1570]
JockeyStatus:
 kmod:nvidia_experimental_304 - Experimental NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
 kmod:nvidia_experimental_310 - Experimental NVIDIA binary Xorg driver, kernel module and VDPAU library (Free, Disabled, Not in use)
 kmod:nvidia_current - nvidia_current (Proprietary, Enabled, Not in use)
 kmod:nvidia_current_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
MachineType: System76, Inc. The Leopard Extreme
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: root=UUID=e7728359-15b1-4eb6-a7c9-db1b40e7c807 ro quiet splash
SourcePackage: xorg-server
UpgradeStatus: Upgraded to quantal on 2012-10-28 (0 days ago)
dmi.bios.date: 12/14/2010
dmi.bios.vendor: Intel Corp.
dmi.bios.version: SOX5810J.86A.5529.2010.1214.2317
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DX58SO
dmi.board.vendor: Intel Corporation
dmi.board.version: AAE29331-503
dmi.chassis.type: 2
dmi.modalias: dmi:bvnIntelCorp.:bvrSOX5810J.86A.5529.2010.1214.2317:bd12/14/2010:svnSystem76,Inc.:pnTheLeopardExtreme:pvrleo1:rvnIntelCorporation:rnDX58SO:rvrAAE29331-503:cvn:ct2:cvr:
dmi.product.name: The Leopard Extreme
dmi.product.version: leo1
dmi.sys.vendor: System76, Inc.
version.compiz: compiz 1:0.9.8.4+bzr3407-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 quantal running-unity ubuntu
-- 
[regression] X11 screen blanking after 10 minutes with no UI to change it
https://bugs.launchpad.net/bugs/1072531
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