But I learned one more lesson:īefore to modify/update software be sure that you've test several alternatives: another monitor, computer, cable, OS etc Step #5: Check/Change refresh rate The cable was cheap VGA cable which was plugged in wrong way. I've tried many solutions described on the web:Īfter a day of unsuccessful experiments - I decided to check the cable. I was working on Ubuntu 18.04 which had artefacts and tearing on the picture. Step #4: Check/Change your cable and/or video card You might also try to login in Software Rendering mode (on the login screen) in order to check flicker. One more option for cinnamon restart is: CTRL + ALT + ESC
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