Comment # 1 on bug 111042 from freedesktop@fractalyse.info

Hi,

This is NOT A BUG, you installed 18.40-697810 which doesn't build with kernel
4.18.0-25. 

You have to install more recent version of driver.

Minimum required version to build with kernel 4.18 is 19.10-785425.
Consider installing latest release 19.30-838629.

Cheers