Comment 2 for bug 1503758

In the corresponding OEM bug, we have below findings:

"after debug, we found that if we insmod the touchscreen driver after x start, the u-s-d xrandr plugin will not do "do_touchscreen_mapping" function, seems this is a u-s-d xrandr plugin can not support hot plug issue."

"I think an alternative way is fix the u-s-d xrandr plugin can not detect touchscreen hot plug and set variable "priv->main_touchscreen_id" error issue, but as a workaround, we can insmod the touchscreen after X start."