The Clockwork Man Demo - system shutdown

[SeedYum]

Since I don't have any Linux games in my library at the moment, I've been testing some demos. One of them is The Clockwork Man, and I'm having some issues with it. The title bar still appears even in fullscreen mode, and I cannot access Steam Community with Shift+Tab. But most important is that the game slows down after some time, and my computer shuts down. I don't know if it's a system error or if it makes it overheat.

System details:

Processor Information:
Vendor: GenuineIntel
Speed: 2394 Mhz
4 logical processors
3 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: 3.2.0-35-generic
X Server vendor: The X.Org Foundation
X Server release: 11103000

Video Card:
Driver: Intel Open Source Technology Center Mesa DRI Intel(R) Ironlake Mobile x86/MMX/SSE2

Driver Version: 2.1 Mesa 9.0
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID: 0x8086
DeviceID: 0x46
Number of Monitors: 1
Number of Logical Video Cards: 1
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 Not Detected

Sound card:
Audio device: IDT 92HD81B1X5

Memory:
RAM: 3755 Mb

Miscellaneous:
UI Language: English
LANG: pt_BR.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 156089 Mb
Largest Free Hard Disk Block: 64827 Mb

Installed software:

Recent Failure Reports:

[Pixelsprite]

Hello Amon + a happy new year!
The Clockwork Man games don't use the Steam overlay. The games are not very hard on resources, perhaps you can try the following:

TCM 1+2 currently rely on the wmctrl library for fullscreen support. We are working on an update to the fullscreen issues that will cut the dependency on wmctrl.

You can install wmctrl by running: sudo apt-get install wmctrl

If you have some time, could you try this and let me know if it solves the issues?