How to reset the screen through command?

[dukelec]

I tried many distributions of openmoko(current is FSR on FreeRunner), the
same problem is : There was nothing display but white when resume from black
screen sometimes.

I consider to write a shell, and bind it to aux button... but I need the
command which can reset & init screen(How To?)...

It's better for me if you guys to put the actions to kernel...
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