*** This bug is a duplicate of bug 415023 ***
    https://bugs.launchpad.net/bugs/415023

Same issue here with U100.  The right-mouse-button trick works, but when
on battery power, screen dims shortly afterwards and screen flicker
continues.  Have disabled "reduce backlight brightness" and "dim display
when idles" in power manager -> On Battery Power, and this seems to
prevent the recurrence of

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screen brightness flickers at login screen
https://bugs.launchpad.net/bugs/423873
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