An ugly hack within the Linux kernel that has been in mainline for over three years has been called out. Due to a buggy X.Org Server / xf86-video-modesetting DDX, the Linux kernel has been imposing different behavior on whether a process starts with “X” and in turn disable the atomic mode-setting support…

Source: Phoronix – The Linux Kernel Has Been Forcing Different Behavior For Processes Starting With “X”