Minimum backlight level is not as dim as I want. I want to be able to tune it to arbitrarily low level, for example to be hardly visible in a dark room (but still visible).
In my digital camera I've implemented switching off and on backlight fast enough so it looks very dimmed.
How to do it in my laptop? It uses some intel video card, so
aticonfig is no use.
Tools like "Dimmer" (that just makes pixels darker colour, attempting to "fix" excess brightness by filtering it in LCD) are not acceptable: even screen with all pixels set to black looks too bright.
- Fast enough repeated low level switching it on and off (not xbacklight/xrandr/other_things_that_turn_off_display). Only backlight, not LCD itself.
- Modifying something by hardware means (e.g. installing additional switch and resistor), if it is simple and safe.
Pressing Fn+F6 does almost what I want from "Low level switching", but I cannot "press" it programmatically.