Christopher, I'll try to do that after I understand what it means being
booted up into a "Ubuntu repository kernel (not a mainline one)". I'll
read the pages you linked.
Meanwhile I'd like to point out that a proper workaround is to use
xbacklight -set NNN (0 to 100) and not xrandr as in the comments above.
According to the xrand man page:
--brightness brightness
Multiply the gamma values on the crtc currently attached to
the output to specified
floating value. Useful for overly bright or overly dim outputs.
However, this is a
software only modification, if your hardware has support
to actually change the
brightness, you will probably prefer to use xbacklight.
It's not installed by default.
sudo apt-get install xbacklight
xbacklight works fine on my hardware. The problem is only with the Fn
F9/F10 keys (and the brightness slider in the settings too). Thet don't
change the backlight despite changing the brightness indicator in the
gnome popup (I'm back to gnome as I found workarounds to other issues I
had). As those keys work in KDE I suspect that we are facing two
different problems:
1) A kernel one that applies to other commenteers but not to me. Does
xbacklight work for them?
2) A gnome one that applies to me: it seems it's not making the right calls in
response to Fn F9/F10. KDE does.
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https://bugs.launchpad.net/bugs/1257766
Title:
[HP ZBook 15] can not reduce brightness
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