Hey guys, I am new to the whole Linux world so please be gentle with me if I dont articulate myself perfectly.
I installed Manjaro (KDE) on my Dell XPS 15 7590. But I have the problem that I cant adjust my brightness.
Function + F12 shows the dialog on screen but it doesnt help anything. Also trying to change the brightness over the power options didnt help.
Any Ideas?
Hello and welcome,
This should be straight forward:
https://wiki.archlinux.org/index.php/Dell_XPS_15_7590#Backlight
Not being dismissive, but that information is already very well written and probably helpful for more things to tweak in case is needed. 
Thanks for the fast anwser! I tried what they told on this website. I tried installing the package over the software manager. But this failed. You can see my error message below.
First of all, that is a linux kernel with the oled patches applied. Please read their AUR page
https://aur.archlinux.org/packages/linux-oled/
Is more to building/using a custom kernel than might appear at first sight. Always read the documentation/ references to the wiki more than once, so you understand what is what.
You need just the light package and then set the keyboard mapping correctly.
I cant quite keep up. So I went to your webpage. There I read that my package has some depencies. I installed all of them with sudo pacman -S coreutils initramfs …
Then I went back to the software manager and tried to install again. Now this happended:
“Building linux-oled…
==> Making package: linux-oled 5.7.10.arch1-1 (Sa 22 Aug 2020 18:56:28 CEST)
==> Checking runtime dependencies…
==> Checking buildtime dependencies…
==> Retrieving sources…
-> Updating archlinux-linux git repo…
Fetching origin
-> Found config
-> Found sphinx-workaround.patch
-> Found 0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch
-> Found 0002-WIP-drm-i915-Enable-Intel-s-HDR-backlight-interface-.patch
==> Validating source files with sha256sums…
archlinux-linux … Skipped
config … Passed
sphinx-workaround.patch … Passed
0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch … Passed
0002-WIP-drm-i915-Enable-Intel-s-HDR-backlight-interface-.patch … Passed
==> Verifying source file signatures with gpg…
archlinux-linux git repo … FAILED (unknown public key 3B94A80E50A477C7)
==> ERROR: One or more PGP signatures could not be verified!
Failed to build linux-oled”
Hi!
Try sudo pacman -Syyuuu then install the package
I did run your command. It download for a few minute some stuff.
After that i resarted my pc as the console told me to.
Then I tried installing it over the manjaro store as well as the console.
Still same error: “unkown public key”
Hi!
Try this
sudo pacman -Sc && sudo pacman-key --init
This would delete Pacman cache and try to add the gpg keys again
Hi this unfortunately also didnt work. I still have the same error:
==> Verifying source file signatures with gpg…
archlinux-linux git repo … FAILED (unknown public key 3B94A80E50A477C7)
==> ERROR: One or more PGP signatures could not be verified!
Failed to build linux-oled
Hi!
Looks like there’s a problem with that gpg, here is a way to fix it
curl -s https://keybase.io/heftig/pgp_keys.asc\ … 8b0d70fc30 | gpg --with-colons --import-options import-show --dry-run --import | grep 3B94A80E50A477C7
And here where it come from
https://bbs.archlinux.org/viewtopic.php?id=255968
Hi, this also didnt see to work. I wrote this in the console. Following happened:
[sam@xps ~]$ curl -s https://keybase.io/heftig/pgp_keys.asc/?fingerprint=a2ff3a36aaa56654109064ab19802f8b0d70fc30 | gpg --with-colons --import-options import-show --dry-run --import | grep 3B94A80E50A477C7
gpg: key 19802F8B0D70FC30: 3 signatures not checked due to missing keys
gpg: Total number processed: 1
sub:-:256:22:3B94A80E50A477C7:1589200740::::::s:::::ed25519::
fpr:::::::::06687A1D9D4FAB08B50FD92B3B94A80E50A477C7:
After that I restarted my computer and then I retried installing linux-oled. Same error 
I am even thinking of just reinstalling manjaro 
