How to reset the screen through command?

[dukelec]

I also want to set LCD frequency from 73Hz to 60Hz, reduce EMI, maybe useful.
(How to do this?)

I got this error:

root at om-gta02 /sys # xrandr -q
Screen 0: minimum 240 x 320, current 480 x 640, maximum 480 x 640
LCD connected 480x640+0+0 (normal left inverted right) 43mm x 58mm
   480x640        72.5*+
   640x480        72.8     59.9  
   240x320        50.2  
root at om-gta02 /sys # xrandr -s 640x480
X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  2 (RRSetScreenConfig)
  Value in failed request:  0x280
  Serial number of failed request:  14
  Current serial number in output stream:  14
root at om-gta02 /sys # xrandr -r 60
Rate 60.0 Hz not available for this size
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