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There are many questions to do with screen brightness on Linux Mint (this and this refer to default brightness being zero, and this to there being only two brightness levels.)

My problem is a bit different: I have too few brightness levels to choose from when using the function keys.

There are only three settings between full and completely off! If I'm working in a dark room, I need a very low brightness, but it still needs to be more than off!

I have Linux Mint 17 running on an HP Envy 14. The brightness settings in Screensaver and Lock Settings works better than the function keys do (I can get a dimmer level there) but it's still not brilliant.

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LondonRob
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  • Do you have files in `/sys/class/backlight/acpi_video0` or `/sys/class/backlight` ? A file called `brightness` would be a great place to start. – John WH Smith Jul 27 '14 at 00:50
  • Yes! In `/sys/class/backlight/acpi_video0` the file `brightness` contains `1 6`. In `/sys/class/backlight/acpi_video1` the same file contains `1 6`. In `/sys/class/backlight/intel_backlight/brightness` it contains `1 2907`. – LondonRob Jul 31 '14 at 21:28
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    Files in `/sys/class/backlight` will allow you to control your brightness at a file level. For instance, `max_brightness` files set your maximum brightness level. `brightness` and `actual_brightness` control your current brightness level. Write to these files and see how things change ;) – John WH Smith Jul 31 '14 at 21:33
  • Wow. How interesting! Isn't Linux endlessly fascinating! Any idea how I can write to `max_brightness`? – LondonRob Jul 31 '14 at 21:51
  • Just like you write to any other file. Use an [editor](http://en.wikipedia.org/wiki/Text_editor), or a [shell redirection](http://en.wikipedia.org/wiki/Redirection_%28computing%29). – John WH Smith Aug 01 '14 at 13:17
  • @JohnWHSmith but what if the permitted values are only 1 to 12? – Pithikos Dec 22 '16 at 14:58

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