I am using raspberry pi 4 and the official touchscreen. I config Pi 4 with an external HDMI display.
However, whenever the system boot into Linux, the display only shows the rainbow color, then the boot information of raspberry pi, and then it boot into the black screen.
I have digged into some topic related to this problem, but most of them says that the firmware of the touchscreen is already in the Archlinux kernel, it should work properly. To prove it was not due to out of box problem, I then install gnome to see whether the icon is display or not. However, the remains black with only back light. I could not and do not know how to find the log info to see where went wrong.
Hope someone can help me identify the problem.
Thanks in advance.