TP-755CX screen dims using battery

[Chris Hanson <cph@martigny.ai.mit.edu>]

   From: manning@cs.vassar.edu (Joseph Manning)
   Date: Fri, 11 Aug 95 15:17:26 EDT

   The screen on my new SVGA TP-755CX dims considerably
   whenever I remove the AC power cord and it switches to
   battery power.  This happens even when the Li-ion battery
   shows a 100% charge, and the computer is configured for
   "High Performance" under battery power.

   My questions:

     - is this normal, or do I perhaps have a weak battery?

     - if it is normal, then is there any way to circumvent
       this dimming, even if it shortens battery life?

I don't know specifically about the 755CX, but on older models there
is a power-saving mode called "economy brightness mode" that is the
default.  This mode can be changed using the PS2 program under DOS:

* PS2 BR N puts the machine in "normal" mode, in which the screen is
  the same brightness whether using AC power or battery power.

* PS2 BR E puts the machine in "economy" mode, in which the screen is
  dimmer when using battery power.