[arch-general] X keeps crashing

[SET]

I started to have exactly the same problem on my new HP laptop, complete UI 
and peripheral freeze. By just pulling out the power cord, the system 
instantly becomes responsive again and I can continue work normally. It won't 
appear again until next reboot, always randomly. I always find a vgaarb error 
in everything.log at the very moment of the lockup :

Feb  9 08:03:47 hp2 kernel: [70005.222588] vgaarb: this pci device is not a 
vga device

The above line is also logged without any system freeze.

I wish to know if the trick works for you, please update.

Cheers.