On Wed, 2018-04-11 at 22:49 -0400, Liwei Song wrote:
> On my CoffeeLake S board, after compile i915 as a kernel module
> will got following error in Xorg.0.log:
>     (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission 
> denied
>     (EE) open /dev/fb0: No such file or directory
> This is a timing proble between i915 driver and Xorg,
> add a loop to wait device got ready can avoid this timing problem

Ew. Why not delay starting your server until the device nodes exist?
'udevadm settle' perhaps?

- ajax
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