Note that tearing on all-but-one monitor in Xorg sessions is expected. It's an unfortunate feature of Xorg with DRI2. If you can convince the system to use DRI3 and TearFree then that avoids it. But that feature also doesn't exist for all graphics drivers.
Please run:
lspci -k > lspcik.txt
and attach 'lspcik.txt' as well as your $HOME/.local/share/xorg/Xorg.0.log
Note that tearing on all-but-one monitor in Xorg sessions is expected. It's an unfortunate feature of Xorg with DRI2. If you can convince the system to use DRI3 and TearFree then that avoids it. But that feature also doesn't exist for all graphics drivers.
Please run:
lspci -k > lspcik.txt
and attach 'lspcik.txt' as well as your $HOME/. local/share/ xorg/Xorg. 0.log