Can I fine-tune my screen brightness? (Ubuntu Studio, Thinkpad T420s)

Posted by Dan S on Super User See other posts from Super User or by Dan S
Published on 2012-10-14T20:54:27Z Indexed on 2012/10/14 21:40 UTC
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ubuntu

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laptop

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thinkpad

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brightness

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 brightness in 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.

How can it be done, please?

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