Thank you very much. This solved my issue too. Great find. Weird that this is not enabled by default.
I had same issue with brightness keys, but I’m on i3wm. xbacklight wasn’t working for me for some reason, maybe because of dual graphics. I fixed it by installing acpilight package (it’s in the official arch repos), and adding to my i3wm config file:
bindsym XF86MonBrightnessUp exec --no-startup-id xbacklight -inc 5 && $refresh_i3status
bindsym XF86MonBrightnessDown exec --no-startup-id xbacklight -dec 5 && $refresh_i3status
In order to find out the exact keysyms to set in the config there’s a little handy tool called screenkey (available on AUR), after installing it in the preferences Keys->Keyboard Mode should be set to keysyms.
And there need to be set a udev rule allowing setting brightness without root. I don’t remember whether I set it manually or acpilight did it, but this should go to /etc/udev/rules.d/90-backlight.rules
SUBSYSTEM=="backlight", ACTION=="add",
RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness",
RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness"
I remember having problems with that on my E460.
Will definitely try this out, when im switching back to i3wm from Plasma.
Thank you.
PS: With Plasma it worked out of the box (checked it a second ago). 
Since one week I have problems with my internet connection on my T480 and the USB-C Dock (2nd Gen.). After some time in idle or working on programs that do not need internet connections the internet connection is lost and I have to reboot to use the internet again. During the shutdown process I observed that the ethernet connection is timed out, vpnagent could not be quit or the tlp startup/shutdown could not be quit.
I don’t know if it’s the same docking station but maybe the thread in the Lenovo forum can help a bit…
https://forums.lenovo.com/t5/Other-Linux-Discussions/USB-C-dock-amp-Linux/td-p/3678331
Thank you for your reply. I delt with the driver issue when I started using the docking station and installed the realtek driver.
Now the problem is that I have network connection either via the LAN port of the docking station or the wifi of the Thinkpad, but occasionally the internet connection is lost and I cannot load websites, get emails, etc until I reboot the system.
I had a similar problem with every Arch-based distro and my wifi-connection. Sometimes after I woke up the E460 from sleepmode, sometimes after some time of network inactivity. No problem with the ethernet connection. The wifi was connected, but no bandwidth. I could reconnect and then it worked again.
I tried different things from the energy settings to antenna-configs with some config-files, sometimes it worked for some time and then it came back.
Since my last reinstall of EOS (last week) with the online installer and Plasma as chosen DE the issue seems to be gone (knock on wood).
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Okay, perhaps I should consider a fresh install of EOS.
Thank you 
Although the Welcome application is among the programs that start automatically, its window does not appear after entering the desktop environment. I think it has to do with the fact that the laptop only has a wireless network connection. This is not a big problem, it just came to my mind. to write about it.
Are you sure it is enabled? If you type in a terminal eos-welcome --enable does the problem still persist?
And what DE it is?
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Thank you, the problem is solved. I didn’t think that said app would have to be enabled after it was installed because it ran on another machine without any further intervention.
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On the Lenovo Thinkpad L440 laptop, I cannot open a virtual terminal using CTRL + ALT + Fx. What is the solution?
Do you have your Fx keys set to their Fx function or the alternate function in the bios? If the alternate function, are you holding Ctl + Alt + Fn + Fx?
It’s conceivable, but I think I’ve tried this before. or I did not set an alternative setting for the function keys in the BIOS.
Are you sure the FN lock is not on? FN + Esc turns it on or off. Default is off.
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Thank you, such a simple thing did not occur to me. 
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Not sure if this was your problem but i thought i would mention it. 
I think that was the problem. But this is my first Lenovo laptop, I’ve only used HP and Toshiba and Asus so far, so I have to get used to it.