I am in a similar situation as question Can I fine-tune my screen brightness? . For me, Thinkpad T420s and Ubuntu Studio 11.10. The brightness keys work fine but the increments are too large. I have the
/sys/class/backlight/acpi_video0 and I can see the value of
actual_brightness changing as I use the brightness keys - it changes between values 0,3,6,9,12,15.
None of the listed answers for fine control works here, as follows:
- As the root user I can echo integers to
brightnessin the above folder. As an ordinary user I cannot.
- I do not have
/usr/sbin/gnome-power-backlight-helper(because I'm using xfce perhaps?), and not sure what package it's from or if installing such a package would make sense since it's not what's currently managing the backlight.
EDIT: In an answer below, I describe a command-line way to do it. However, I'd like the brightness keys on my keyboard to do smaller steps. I don't know what component handles those keys (I'm in Xfce BTW). Which component is handling it, and how can I configure it to use finer steps please?