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XOrg freezes for about 30 seconds and this warning is printed in the
syslog:

kernel: [  752.250482] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95)
kernel: [  752.250740] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95)

However, the console still works while X is frozen.

This is a Dell XPS L702X with optimus graphics.

The freeze appears to occur randomly. 
Using nautilus, gedit or other gtk3-programs seems to cause it happen more frequently.  Eclipse and Chromium that uses gtk2 does not seem to trigger the bug.

There are two similar bugs:
https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/+bug/1362532
https://bugs.launchpad.net/ubuntu/+source/linux-lts-saucy/+bug/1281966

3.13.0-39-generic x86_64

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Dell Device 04b8
	Flags: bus master, fast devsel, latency 0, IRQ 52
	Memory at f2400000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 5000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915


01:00.0 VGA compatible controller: NVIDIA Corporation GF106M [GeForce GT 550M] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: Dell Device 04b8
	Flags: bus master, fast devsel, latency 0, IRQ 51
	Memory at f0000000 (32-bit, non-prefetchable) [size=32M]
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d0000000 (64-bit, prefetchable) [size=64M]
	I/O ports at 4000 [size=128]
	Expansion ROM at f2000000 [disabled] [size=512K]
	Capabilities: [60] Power Management version 3
	Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [78] Express Endpoint, MSI 00
	Capabilities: [b4] Vendor Specific Information: Len=14 <?>
	Capabilities: [100] Virtual Channel
	Capabilities: [128] Power Budgeting <?>
	Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
	Kernel driver in use: nouveau

LSB Version:	core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.1 LTS
Release:	14.04
Codename:	trusty

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete

-- 
30 sec Xorg freeze - ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95)
https://bugs.launchpad.net/bugs/1391652
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