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[asala <1310316@xxxxxxxxxxxxxxxxxx>]

Further info on my previous comment: If I set scaling to "1" in both "unity tweak tool" and "Display" settings, then logging on several times does NOT increase the scaling. 
If, from that starting conditions, I modify on the "displays" ("monitores" in Spanish) settings (native Ubuntu) then the scaling keeps constant between logons, and you see the same value in "unity tweak tool" and "Display" controls.

However, ifstarting with the same (but different from 1) setting in
displays and tweak tool, then you change the setting in "unity tweak
tool" then it does NOT change in the display one, and actually the one
in Unity Tweak Tool at next logon seems to be the product of both...
and, as commented in #18, it leads to an exponential increase.

A variation of workaround #18. setting the "Display" setting to one and
keeping it different from one in "unity tweak tool" does work for me.

SO, it seems that interferences mentioned in #2 and #7 can be confirmed
and perhaps the bug is in "unity-tweak-tool".

Although I am not a developer, it would be nice to confirm if some of you suffers the bug without unity-tweak-tool installed.
As the maintainer of "unity-tweak-tool" is Barneedhar Vigneshwar, I subscribed him to this bug.

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https://bugs.launchpad.net/bugs/1310316

Title:
  Text scaling factor changing unexpectedly

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  I have a MacBook pro with a Retina display. I have set the "Scale for
  menu and title bars"  setting (into Settings > Displays) to 1.5 to
  make the UI looks good on my screen. That works very well. But
  sometimes, usually after logging, all the fonts of the UI become much
  bigger.

  When that happen I open unity tweat tool and notice that the text
  scaling factor changed to 2.25. If I reset it to 1 the all the fonts
  go back to normal.

  The problem does not happen all the time. I would say it happen one
  time out of three logging. It may also happen when installing
  applications from the software center. I have yet to find a procedure
  to reproduce it all the times.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140416-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: wl nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sun Apr 20 18:21:02 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed
   bcmwl, 6.30.223.141+bdcom, 3.13.0-24-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-24-generic, x86_64: installed
  GraphicsCard:
   NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Device [106b:00f2]
  InstallationDate: Installed on 2014-04-19 (1 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64+mac (20140417)
  MachineType: Apple Inc. MacBookPro10,1
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=3d5a4115-5e15-4eca-bd1c-0bee2543a1cb ro quiet splash
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/21/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP101.88Z.00EE.B03.1212211437
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-C3EC7CD22292981F
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-C3EC7CD22292981F
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B03.1212211437:bd12/21/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
  dmi.product.name: MacBookPro10,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Sun Apr 20 18:04:05 2014
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.15.1-0ubuntu2

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