Poor Mouse response on Ubuntu 14.04.2 LTS

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Hello everyone,
I am currently playing on Ubuntu 14.04.2 LTS and I am experiencing a very poor mouse response (on minimal settings and fullscreen). Furthermore if I switch to window mode I just see part of the screen without possibility to scroll around.
I have installed the game on the same computer on Windows 7 without these troubles.
Is there anything I can do to imrove the mouse response and get the window mode running?
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[MangoFusion]

Hi there,

If you could, please let us know your system specs, and also which version you are using (steam or the standalone version).

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I am using the steam version.

System specs:
Processor: AMD Turion(tm) II Ultra Dual-Core Mobile M600 (Dual Core, 2.4 GHz)
Memory: 3.9 GiB (DDR2)
Graphics: Gallium 0.4 on AMD RV710 (Mobility Radeon HD 4530/4570/545v)
OS type: 64-bit

Hopefully that helps.