- Original shipping condition:
* Dell Farallon + WX2100
* linux-image-4.4.0-36-generic + amdgpu-17.10-429170

- Test procedure:
1. sudo apt install linux-image-4.4.0-xxx-generic 
linux-headers-4.4.0-xxx-generic
2. reboot 

Expected behavior 
System can boot into desktop successfully to the updated kernel

Actual behavior 
Loop at login session

- Findings:
1. amdgpu DKMS fails to build exactly between 4.4.0-142(OK) and 4.4.0-143(NG) 
kernels
2. However, starting from 4.4.0-116 kernel, amdgpu module fails to load with 
the following error message:
amdkcl: version magic '4.4.0-xxx-generic SMP mod_unload modversions' should be 
'4.4.0-xxx-generic SMP mod_unload modversions retpoline' 

- In summary, the issue has 2 causes, amdgpu loading error and amdgpu
DKMS build error, the former happens in earlier kernel revisions than
the latter.

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https://bugs.launchpad.net/bugs/1820323

Title:
  amdgpu-pro xorg crash

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