Machine:
Alienware Mx14 R1 laptop with ubuntu 12.04 to date.
nVidia Drivers updated to 304.64. Steam client started with "optirun" command to enable the usage of the discrete video card (GT 555m).

SystemInfo:
Processor Information:
Vendor: GenuineIntel
Speed: 2401 Mhz
4 logical processors
2 physical processors
HyperThreading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported

Network Information:
Network Speed:

Operating System Version:
Ubuntu 12.04.1 LTS (64 bit)
Kernel Name: Linux
Kernel Version: 3.2.0-29-generic
X Server vendor: The X.Org Foundation
X Server release: 11103000

Video Card:
Driver: NVIDIA Corporation GeForce GT 555M/PCIe/SSE2

Driver Version:  4.2.0 NVIDIA 304.64
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID:  0x10de
DeviceID:  0xdcd
Number of Monitors:  1
Number of Logical Video Cards:  2
Primary Display Resolution:  1366 x 768
Desktop Resolution: 1366 x 768
Primary Display Size: 12.17" x 6.85"  (13.94" diag)
                                        30.9cm x 17.4cm  (35.4cm diag)
Primary VRAM: 1535 MB

Sound card:
Audio device: Intel CougarPoint HDMI

Memory:
RAM: 3902 Mb

Miscellaneous:
UI Language: English
LANG: en_GB.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 54716 Mb
Largest Free Hard Disk Block: 9373 Mb

Installed software:

Recent Failure Reports:

Description:

• Steam client running.
• Put laptop in Stand-by.
• Revert from stand-by.
• Steam Client frozen: using top command gives MainThread 110% CPU utilization. No other method found except killing the process and restarting it.

If further info is needed let me know!