brightness FN + F5/F6 after Fedora 26 upgrade

asked 2017-08-25 15:16:38 -0500

fhortner gravatar image

after upgrading from Fedora 25 to Fedora 26 KDE spin on my HP Elitebook 840 G3, the brightness control does not work anymore. I can only change the brightness via xbacklight or echoing. It worked after a kernel upgrade on 25, but with 26 it does not work at all.

I tried to add 20-intel.conf with: Section "Device" Identifier "Card0" Driver "intel" Option "Backlight" "intel_backlight" EndSection

wich did not work.

Then I tried to check if the fn+f5 and fn+f6 keys are recognized by the system with the commands:

acpi_listen as well as showkey -s

both keys are not recognized under X11 (Gnome and KDE). Other special fn keys are recognices (for example volume up/down). Then I tried to install Gnome with Wayland. Here brightness changes with the special fn f5/f6 keys works fine.

Reproducible: Always

Steps to Reproduce: 1. press fn + f5 2. press fn + f5 3. press fn + f5 Actual Results: nothing happens

Expected Results: brightness shoult be reduced

to find a solution I tried different things:

I tried to add 20-intel.conf with: Section "Device" Identifier "Card0" Driver "intel" Option "Backlight" "intel_backlight" EndSection

wich did not work.

Then I tried to check if the fn+f5 and fn+f6 keys are recognized by the system with the commands:

acpi_listen as well as showkey -s

both keys are not recognized under X11 (Gnome and KDE). Other special fn keys are recognices (for example volume up/down). Then I tried to install Gnome with Wayland. Here brightness changes with the special fn f5/f6 keys works fine.

Does anyone here has an idea how to solve the problem?

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