Hello, I am writing this mail to get some help for my problem I faced.
I wrote a simple app which fills my HDMI monitor with red color.
This app just opens /dev/fb0, which is the framebuffer driver file for HDMI display driver, gets screen information via ioctl, fills the color with mmaped buffer.
This application works well on debian-BBB Linux, which covers default desktop image with the red color.
However, when I removed lightdm via apt-get remove command to disable the default GUI, this frame doesn¡¯t work.
To be specific, when I removed lightdm, it seems that the tilcdc driver couldn¡¯t find my monitor. My monitor shows the message (¡°There is no device connected to the HDMI port¡±).
Should I do something special to enable display when I remove the lightdm?
It would be very appreciate if someone can give me some advices.
Windows 10¿ë ¸ÞÀÏ¿¡¼ º¸³¿