Sometimes old projects are back. Made some updates for my utility, which is used to control brightness of a display, connected to the X220/X230 via the AGAN X230 board (from AliExpress):

- Since I'm using Awesome WM and don't want to write a logic to change brightness on the Lua, I added the --increase-brightness / --decrease-brightness options to change it by one step.

- Add option --percent to display current brightness level not as internal value from board, but as percentage.

- Update man page, add ChangeLog.

For now it is tested under 14.1-14.3.

codeberg.org/evgandr/brightnes

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