screen brightness slider has no effect

[Kevin Leeds]

If I go to System Settings - Brightness and Lock then I can find a Brightness slider input. But when I move the slider to a different position, the brightness of the screens does not change.

Earlier I said f.lux does not work either. I have found that f.lux does not install correctly and should not be expected to work apparently. People say to get resdshift instead. I get messages from python about unset

The software called redshift is able to make the screens a different color, so that is good.

sudo echo 50 > /sys/class/backlight/acpi_video0/brightness

Trusty Tahr 14.04 updated to current

This status is invalid so I should not be editing it, I should be editing the duplicate. Sorry about the duplicate.

[Kevin Leeds (knleeds)]

ok, it is not ubuntu-docs. apparently an errant keystroke enabled me to submit the bug before it was correct in any way. I'll try again (how do I delete it? edit it? I'm the one who tried to make it! sorry!!)

[Kevin Leeds (knleeds)]

How do I delete this stupid erroneous mistaken typo bug report

[Manfred Hampl (m-hampl)]

You need not delete this bug document. You can edit the header information and correct whatever you think is wrong.

[Kevin Leeds (knleeds)]

I am not sure whether it should really be a question, or a bug. I have found the little pencil, so that is progress.