thanks for trying

Well. I was not going say anything.
I used a have a problem on my touch screen atom netbooks where the screen would dim to 1/2 brightness while the kernel was loading stuff.
About 1/2 way through. My hotkeys would not work either. So I made a app launcher instead in the tool bar which would launch a slider control. My installs would run at 1/2 screen brightness.

So. I fixed it that way. Trouble is. I did this ages ago and I have a plethora of laptops and netbook linux installs and I can't remember what the hell I did to fix this problem exactly. I did not document this fix real well either.


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I think I used this site also


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I am also wondering if a newer kernel < using smxi and liqourix kernels>  and installing Would accomplish anything. But I am not afeared of breaking my installs and will tinker quietly. Sometimes I am the windshield.  Sometimes I am the bug.

I am just mentioning this because of
2015 aint real real new. But maybe? This is why I poke and hope sometimes. Take my post with a grain of salt if happy with how things are so far. I can be a bear in china cabinet when giving advice using AntiX/Debian/Jessie. Like mentioned earlier. I do a lot of stuff on my own. Outside of the forum environment.

What does
ls /proc/
and
ls /proc/acpi
show?

In antiX-17 we added a backlight-brightness command that may provide the functionality you need.  it controls the brightness with the file /sys/class/backlight/*/brightness.  It provides a graphical slider and you can also call it from a startup script to set the brightness when your system starts.  The live-usb system will automatically save your backlight brightness across reboots.  This is independent of the backlight-brightness program.

I've attached a small tarball that contains the backlight-brightness program.  I don't* think* it has any dependencies.   You could install it with these commands: The first command unpacks the tarball.  The second one switches to the backlight-brightness-01 directory that was just created.  Then I suggest you see if you can run the program as root.  If that doesn't work then you should skip the remaining steps which copy the executable to /usr/local/bin and copy the udev rule to /etc/udev/rules.d/.   The udev rule is required to allow non-root users to adjust the brightness.  It won't kick in until you reboot but there is probably a way to get it to run using udevadm.

If this works then it should be straightforward to use xbindkeys to get your brightness Fn keys working.  If xbacklight is already working then you may be able to use xbindkeys with that to get the Fn keys working, without installing the new program.  Here is an example:
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