Created attachment 717756 [details]
/var/log/Xorg.0.log

Description of problem:
While playing a full-scren video on the laptop display (and doing something on the attached large LCD display) Xorg freezes from time to time (no SSH access, and I had to switch it off with a power switch). I've got this /var/log/Xorg.0.log.old with a nice backtrace (I haven't seen anything interesting in dmesg output, and obviously I don't have anything from the frozen state).

Laptop is Lenovo Thinkpad T520 with Samsung SyncMaster 2243 LCD attached.

Version-Release number of selected component (if applicable):
xorg-x11-drv-intel-2.20.17-2.el7.x86_64
xorg-x11-server-Xorg-1.13.1-3.el7.x86_64
kernel-3.7.0-0.31.el7.x86_64

How reproducible:
sometimes (like once a week)

Steps to Reproduce:
1.play video full-screen
2.
3.
  
Actual results:
computer freezes hard

Expected results:
it shouldn't

Additional info:
matej@wycliff: ~$ lspci 
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 6 Series/C200 Series Chipset Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM67 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 3e)
0d:00.0 System peripheral: Ricoh Co Ltd PCIe SDXC/MMC Host Controller (rev 08)
0d:00.3 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 PCIe IEEE 1394 Controller (rev 04)
matej@wycliff: ~$