Customer found i.MX6Q Android 6.0.1 screen will became weird (HDMI-display-weird.jpg) and console show error message (HDMI-error-console.jpg) after plugin/out HDMI cable several times. However, this issue isn't easy to duplicate manually . So customer use another way to duplicate with below command (HDMI-error-console.jpg). Then screen will became weird and show error message same as plugin/out HDMI cable serveral times manually. If change mode back, the screen will became normal (HDMI-display-re-change.jpg), but with flick and mouse cursor lag, and error message (imx6.gralloc: FBIOPAN_DISPLAY failed: Invalid argument) still keep print.
Software: Android 6.0.1
echo "V:640x480p-60" > mode
imx6.gralloc: FBIOPAN_DISPLAY failed: Invalid argument