And almost one year later.... 

This affects me too on two different Dell Optiplexes. One with Mint 17 and the other with Mint 15. The crashes seem to happen independently of what I'm doing.

On my Mint 17 one of three crashes this morning happened a short while ago:

Aug  9 08:17:01 smshop-OptiPlex-960 CRON[3592]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Aug  9 08:30:55 smshop-OptiPlex-960 kernel: [ 3973.820013] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle
Aug  9 08:31:07 smshop-OptiPlex-960 kernel: [ 3985.821745] Watchdog[2855]: segfault at 0 ip 00007ff3dd1a9dde sp 00007ff3ccb2a670 error 6 in chrome[7ff3d9283000+51d2000]
Aug  9 08:31:28 smshop-OptiPlex-960 mdm[1345]: WARNING: mdm_slave_xioerror_handler: Fatal X error - Restarting :0
Aug  9 08:31:28 smshop-OptiPlex-960 colord: device removed: xrandr-Dell Inc.-DELL 2208WFP-G456H8B6542U
Aug  9 08:31:28 smshop-OptiPlex-960 colord: Profile removed: icc-b113de6d7f1642666539494d0c16b53c
######################################################################################################################################################################################################################################################Aug  9 08:32:38 smshop-OptiPlex-960 rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="892" x-info="http://www.rsyslog.com"] start
Aug  9 08:32:38 smshop-OptiPlex-960 rsyslogd: rsyslogd's groupid changed to 104
Aug  9 08:32:38 smshop-OptiPlex-960 rsyslogd: rsyslogd's userid changed to 101
Aug  9 08:32:38 smshop-OptiPlex-960 kernel: [    0.000000] Initializing cgroup 


More about this system:

System:    Host: smshop-OptiPlex-960 Kernel: 3.13.0-24-generic x86_64 (64 bit, gcc: 4.8.2) 
           Desktop: Gnome Distro: Linux Mint 17 Qiana
Machine:   System: Dell product: OptiPlex 960
           Mobo: Dell model: 0G261D version: A00 Bios: Dell version: A04 date: 04/29/2009
CPU:       Dual core Intel Core2 Duo CPU E8400 (-MCP-) cache: 6144 KB flags: (lm nx sse sse2 sse3 sse4_1 ssse3 vmx) bmips: 11969 
           Clock Speeds: 1: 2992.247 MHz 2: 2992.247 MHz
Graphics:  Card: Intel 4 Series Chipset Integrated Graphics Controller bus-ID: 00:02.0 
           X.Org: 1.15.1 drivers: intel (unloaded: fbdev,vesa) Resolution: 1680x1050@60.0hz 
           GLX Renderer: Mesa DRI Intel Q45/Q43 GLX Version: 2.1 Mesa 10.1.3 Direct Rendering: Yes
Audio:     Card: Intel 82801JD/DO (ICH10 Family) HD Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
           Sound: Advanced Linux Sound Architecture ver: k3.13.0-24-generic
Network:   Card: Intel 82567LM-3 Gigabit Network Connection driver: e1000e ver: 2.3.2-k port: ecc0 bus-ID: 00:19.0
           IF: eth0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives:    HDD Total Size: 479.4GB (59.8% used) 1: id: /dev/sda model: WDC_WD1600AAJS size: 160.0GB 
           2: USB id: /dev/sdb model: External_HDD size: 319.4GB 
Partition: ID: / size: 11G used: 6.5G (67%) fs: ext4 ID: /home size: 129G used: 41G (34%) fs: ext4 
           ID: swap-1 size: 8.33GB used: 0.00GB (0%) fs: swap 
RAID:      No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors:   System Temperatures: cpu: 43.0C mobo: N/A 
           Fan Speeds (in rpm): cpu: N/A 
Info:      Processes: 206 Uptime: 13 min Memory: 1438.0/3790.8MB Runlevel: 2 Gcc sys: 4.8.2 Client: Shell inxi: 1.8.4