Can x input driver read from fifo?

[c-aries]

Hi all. I write a x input driver. When the driver read from normal
device it works nice. After I change it to read from fifo, the driver
works nice also before I turn off the Window Manager. After Xorg
process exit, devices are all disabled, the screen won't change to
tty, keyboard don't work also.
I use another computer to ssh and gdb. Find that the Xorg exit
normally, and the linux kernel still work.

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