I have been playing around with an Arch-based install so I can try out the latest KDE Plasma and also the latest Mesa drivers.
Intel actually has several drivers.. for current use there's the x.org driver "xf86-video-intel" (this is an installable package for x.org if it wasn't already installed, and there's the modesetting driver. The two look different (in part because they function differently).
You can see which one you have loaded by using the command: "inxi -G" in the terminal.
/etc/X11/xorg.conf.d/ is the folder location for the conf files
Likely will have to create both these files in the folder
20-intel.conf
20-modesetting.conf
It goes alphabetical, so if you want to switch to the modesetting driver just rename the 20-intel.conf file to something like 20-intel.xxx
20-intel:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "DRI" "3"
Option "AccelMethod" "UXA" # SNA is normal default
#Option "TearFree" "true"
EndSection
Leave tearfree commented out (or leave the line out) if you're using something that already has a compositor like plasma. For Accelmethod, the two you should test are UXA and SNA, you will have to reboot between edits. SNA is faster, but it doesn't look/feel the same, it's subtle.
See which of the two you like better.
Then for modesetting,
Section "Device"
Identifier "Intel Graphics"
Driver "modesetting"
Option "AccelMethod" "glamor"
Option "DRI" "3"
EndSection
Modesetting looks very different. Flatter, but not the same as it's going through opengl.