UPDATE
I finally found a more straight forward method to install rtl8822cs wifi driver.
Howto: Compile and activate RTL8822CS wifi driver - easier version
Open a terminal and do the following:
sudo pacman -S base-devel git bc dkms linux-vim-headersgit clone https://github.com/chewitt/RTL8822CS.gitcd RTL8822CS/sed -i 's/$(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KSRC) M=$(shell pwd)/$(MAKE) -j4 -C $(KSRC) M=$(shell pwd)/g' Makefilesed -i 's/$(CROSS_COMPILE)strip $(MODULE_NAME).ko --strip-unneeded/strip $(MODULE_NAME).ko --strip-unneeded/g' Makefilemake- … (wait about 5 min.) …
sudo make installsudo modprobe 88x2cs