v4.14 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14/ - Boots 
v4.15-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/ - Boots 
v4.15-rc5: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc5/ - Black 
v4.15-rc9: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc9/ - Black 
v4.15 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15/ - Black screen
v4.16-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc1/ - Not tested

I'll try rc2, rc3 and rc4 next.

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  Black screen on 18.04 + AMD RX460

Status in linux package in Ubuntu:
Status in linux source package in Bionic:

Bug description:
  I've been running 16.04 + hwe kernel 4.15 for a while now and recently
  I'm now having a black screen instead. I've also tried an 18.04 daily
  live USB stick, which has the same issue.

  It probably started during an upgrade this week or last week. As a
  start I'm blaming the Linux kernel since booting a 4.13 kernel works
  just fine.

  Known faulty kernel versions are:
   * linux-image-4.15.0-041500-generic (mainline kernel),
   * linux-image-4.16.0-041600-generic (mainline kernel),
   * linux-image-4.15.0-13-generic (Ubuntu kernel),
   * whatever comes with 18.04 daily live USB stick as of 20180404.

  Not sure how to best collect logs and system information for you since
  I'm not used to debugging black screens, so I'm just attaching lspci
  as a start.

  EDIT: Workaround found by adding "amdgpu.dc=0" to kernel boot

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