Anonymous
we have a thinkpad x220 and t420. Here is the Device section from our /etc/X11/xorg.conf config that we have configured for the intel graphics on these laptops which might be helpful. took awhile to nail down all the specifics to get it working best as possible.
We also use this with the compositor picom to get good vsync working (optional). It may seem unintuitive but setting “TearFree” to “true” causes a whole lot of trouble both with and without a compositor for these graphics.
Section "Device"
Identifier "Card0"
Driver "intel"
Option "AccelMethod" "sna"
Option "TearFree" "false"
Option "TripleBuffer" "false"
Option "SwapbuffersWait" "true"
Option "DRI" "3"
EndSection
We do still have lag sometimes watching video in browser though. It’s usually not enough to be a big problem for most kinds of videos, but because of that we use mpv with a browser plugin called ff2mpv that adds a “open in mpv” button to the right click menu on videos. mpv also lets us add a gamma correction curve to video playback so it looks less washed out on the TN panel we have.