[ SOLVED ] where is the backlight dimmer?

[Carney]

Mike...Would not accept the fn key or any f key. Maybe my function keys are disabled.  I learn something new everyday Thank you  Dan

I have this problem too.

I can get change screen brightness fine with a Fn and F5 or Fn and F6 keystroke, but I'm trying to find a way to eliminate the need to hit the Fn key, and just make the F5 and F6 keys act by default as if the Fn key had been held down.

[aus9]

OOPS missed seeing the bit where OP says its solved. Ahh well I will leave it here in case it helps others

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acpi_listen
An internet search suggests running above command.....and then pressing the Function key and the Function number key to dim......or whatever has been setup to dim the screen, and it should show a result.   My image comes from an old Dell which does not use function keys but Fn + up or down arrows for brightless levels.

[dansar]

ok...I was able to install the brightness app on this live usb.  So evidently the LL distro on my HD is bad. how to install ..right click on taskbar..go to ADD NEW ITEMS..click on brightness control plugin...That works fine on this live usb.   Dan

[Mike]

No problem, always happy to help (or try)!   

[dansar]

That's fine  ..I can live with it til the final release.  Thank you for trying to help...much appreciated     Dan

[Mike]

Thank you. Welp, I'm not sure what's going on then. Since you're just starting out with LL, may I recommend that you download and try the new 3.0 beta? It uses a newer version of Xfce with several improvements. It may or may not work out better for you. Sure, it's beta but it might get you by without issue until the final release. Sorry I couldn't help you get that working.

If you'd like to try one last thing, add "video.use_native_backlight=1" to your grub config similar to what Wirezfree suggested near the beginning of this thread. Then reboot.

[dansar]

dan@dan-HP-G60-Notebook-PC:~$ for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done

 /sys/class/backlight/*
cat: /sys/class/backlight/*/brightness: No such file or directory
cat: /sys/class/backlight/*/max_brightness: No such file or directory
cat: /sys/class/backlight/*/actual_brightness: No such file or directory

[Mike]

Whoops, it doesn't look like you pasted the whole command. The easiest thing to do is to click on the Select link above the code to highlight the entire command. Then right-click and paste into the terminal.

[dansar]

dan@dan-HP-G60-Notebook-PC:~$ for interface in /sys/class/backlight/*; do echo -e "\n $interface"; c
>

[Mike]

Interesting. What about the second command?

[dansar]

I get this.....dan@dan-HP-G60-Notebook-PC:~$ xbacklight -set 50
No outputs have backlight property
dan@dan-HP-G60-Notebook-PC:~$

[Mike]

I understand, however I am trying to diagnose if this is X server or hardware related. If you don't mind, please run xbacklight -set 50 to reduce the backlight. If it works, simply run xbacklight -set 100 to set it back to 100%.

Please also post the results of this command:

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for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done

[dansar]

I assigned keys ctrl+1 to xbacklight +10 and ctrl+2 to xbacklight -10.  Neither key combinations worked. As for the %'s I did not do that. I'd rather have a control working properly as it does in Xfce Mint 17.3 on this machine. Dan

[Mike]

Did the xbacklight command that I posted yesterday work for you? Just trying to track down the issue.

[dansar]

I found something...When I right click on the task bar I clicked on "+add new items"...in that menu there is a brightness plugin....I added it to the taskbar but when I hover over the icon I get "no device found"...Dan