Laptop screen stuck on very low brightness

[Björn Persson]

Corey Richardson wrote:
> How are you trying to modify the brightness?

Holding down Fn and pressing the up and down keys is supposed to adjust the 
brightness. A little box is shown in the middle of the screen with a 
horizontal bar that indicates the brightness. That part still works. The bar 
grows and shrinks, but the brightness is not affected.

> Does `xbacklight` work?

All xbacklight commands I try (except for "xbacklight -help") cause the screen 
to flash once and return zero. Even "xbacklight -get" causes a flash, prints 
nothing, and returns zero.

Björn Persson
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