I get this behaviour with my Dell M4800 (3200x1800) with utopic and current 
vivid
However I mostly get the effect when I connect one or two additional displays 
and 
configure them with arandr.

I never had it directly after a reboot.

Restarting the XServer always fixes the problem for me. - Until it is
triggered again.

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https://bugs.launchpad.net/bugs/1332947

Title:
  HDPI: unity randomly turns on large text in universal access

Status in OEM Priority Project:
  In Progress
Status in OEM Priority Project trusty series:
  New
Status in Unity:
  Fix Committed
Status in Unity 7.2 series:
  In Progress
Status in “unity” package in Ubuntu:
  Fix Released
Status in “unity” source package in Trusty:
  In Progress

Bug description:
  I have a macbook pro with retina display. In Ubuntu 14.04 64bit, every
  couple of reboots, the 'large text' option in Universal Access gets
  switched on upon login. It happens in roughly 1 out of 5 reboots for 1
  or more users on the computer.

  It appears to happen to people with small HighDPI screens. In my case, it's 
13 inch at 2560x1600.
  Another example is 13 inch at 1080p -  
http://askubuntu.com/questions/453785/large-text-button-in-universal-access-turns-itself-on-after-reboot-ubuntu-14-0

  unity:
    Installed: 7.2.1+14.04.20140513-0ubuntu2
    Candidate: 7.2.1+14.04.20140513-0ubuntu2
    Version table:
   *** 7.2.1+14.04.20140513-0ubuntu2 0
          500 http://sk.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       7.2.0+14.04.20140423-0ubuntu1.2 0
          500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
       7.2.0+14.04.20140416-0ubuntu1 0
          500 http://sk.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  unity-control-center:
    Installed: 14.04.3+14.04.20140410-0ubuntu1
    Candidate: 14.04.3+14.04.20140410-0ubuntu1
    Version table:
   *** 14.04.3+14.04.20140410-0ubuntu1 0
          500 http://sk.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  
  intel iris pro graphics (lspci -vvv):

  00:02.0 VGA compatible controller: Intel Corporation Device 0a2e (rev 09) 
(prog-if 00 [VGA controller])
        Subsystem: Apple Inc. Device 011a
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 66
        Region 0: Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at a0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 1000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee00018  Data: 0000
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915

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