I am also experiencing this on a Toshiba Z30t-A. The 1920x1080 is a bit
too much for a 13.3" laptop. I've been tinkering with dconf and narrowed
down my desired settings to:

gsettings reset org.gnome.desktop.interface scaling-factor # same as '1.0'
gsettings set com.canonical.Unity.Interface text-scale-factor 1.25
gsettings set org.gnome.desktop.interface text-scaling-factor 1.25
gsettings set com.ubuntu.user-interface scale-factor "{'eDP1': 10}"

But I can't figure out how to make them stick from session to session. I
created a startup script as #22 suggests but font sizes are still all
over the place. (Even if I only tweak the two text-scaling settings and
leave UI scale-factors alone.)

A temporary fix for nailing down the settings would be much appreciated.
As others have pointed out it's GNOME's text scaling setting that seems
to be wonky. (I believe that's the technical term :)

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity in Ubuntu.
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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