Same issue here on multiple dell latitudes E6540 laptops in company
(using Ubuntu 14.04.5). And it does happen after resuming from a
suspend. Almost every open application is affected with
distorted/missing letters. Looks like
and-missing-letters (intel driver issue?). Only restarting lightdm (or
logging out and in again), fixed the situation.

root@tom-laptop:/home/tdesloovere# lshw -sanitize -numeric -C display
       description: VGA compatible controller
       product: 4th Gen Core Processor Integrated Graphics Controller [8086:416]
       vendor: Intel Corporation [8086]
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:33 memory:f5800000-f5bfffff memory:d0000000-dfffffff 

root@tom-laptop:/home/tdesloovere# lspci -vvnn -d 8086:416
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core 
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA 
        Subsystem: Dell Device [1028:05be]
        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 33
        Region 0: Memory at f5800000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [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 
                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
root@tom-laptop:/home/tdesloovere# dpkg -l | grep 
ii  xserver-xorg-video-intel-lts-xenial                          
2:2.99.917+git20160325-1ubuntu1~trusty1             amd64        X.Org X server 
-- Intel i8xx, i9xx display driver

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  On-screen text disappears after suspend

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