I believe I'm experiencing this issue as well. If lightdm loads up, I enter half my password and the flickering happens, I type the rest of my password and am not able to login. I believe the flickering interrupts my typing somehow. When I retype my password entirely after the flickering, it works fine.
I believe I'm experiencing this issue as well. If lightdm loads up, I enter half my password and the flickering happens, I type the rest of my password and am not able to login. I believe the flickering interrupts my typing somehow. When I retype my password entirely after the flickering, it works fine.
Ubuntu MATE 16.04
Ubuntu MATE desktop 1.12.1
CPU: Intel Core i7-6500U CPU @ 3.1GHz
GPU: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)