This bug affects me running 16.04 on an ThinkPad X1 Carbon connected via HDMI to a Diamond Digital display.
Graphics card is Intel® HD Graphics 520 (Skylake GT2)
built-in display is scaled to 1.25, external display is not scaled. When I scale the external display and put it back to 1 then the window decorations are drawn properly.
This bug affects me running 16.04 on an ThinkPad X1 Carbon connected via HDMI to a Diamond Digital display.
Graphics card is Intel® HD Graphics 520 (Skylake GT2)
built-in display is scaled to 1.25, external display is not scaled. When I scale the external display and put it back to 1 then the window decorations are drawn properly.