Public bug reported:

For reference this problem is very similar to #1577074

However, the laptop is simply booting to a black screen on 16.04, the
backlight is on but there is no display. Sound is working so I can hear
the ubuntu logon noise and can SSH from another machine.

During boot the screen on the laptop looks as if it is flashing off and
on trying to set modes or something similar, I'm guessing this is the
looping shown in the output below

Errors from dmesg are as follows:

[   40.744416] [drm:amdgpu_resume [amdgpu]] *ERROR* resume 4 failed -2
[   40.744453] [drm:amdgpu_resume_kms [amdgpu]] *ERROR* amdgpu_resume failed 
(-2).
[   40.744613] amdgpu 0000:04:00.0: couldn't schedule ib
[   40.744690] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   40.744744] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   40.807470] r8169 0000:02:00.0 eno1: link down
[   40.807472] r8169 0000:02:00.0 eno1: link down
[   40.807573] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready
[   41.933648] amdgpu 0000:04:00.0: couldn't schedule ib
[   41.933721] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   41.933747] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   42.475349] r8169 0000:02:00.0 eno1: link up
[   42.475375] IPv6: ADDRCONF(NETDEV_CHANGE): eno1: link becomes ready
[   45.115657] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.115712] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.115735] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.115739] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.115758] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.115776] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.115779] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.115797] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.115854] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.115858] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.115882] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.115905] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.115908] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.115930] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.115952] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.115955] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.115976] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.115998] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.118843] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.118907] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.118933] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.123106] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.123215] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.123246] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.123252] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.123279] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.123304] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.123308] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.123334] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.123359] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.135599] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.135676] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.135711] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.136796] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.136902] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.136932] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   45.152655] amdgpu 0000:04:00.0: couldn't schedule ib
[   45.152748] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   45.152777] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   46.251287] amdgpu 0000:04:00.0: couldn't schedule ib
[   46.251345] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   46.251366] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   46.251466] amdgpu 0000:04:00.0: couldn't schedule ib
[   46.251485] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   46.251504] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!
[   46.251533] amdgpu 0000:04:00.0: couldn't schedule ib
[   46.251551] [drm:amdgpu_sched_run_job [amdgpu]] *ERROR* Error scheduling IBs 
(-22)
[   46.251570] [drm:amd_sched_main [amdgpu]] *ERROR* Failed to run job!


Output of lspci and lshw are attached

Many thanks
James

** Affects: xserver-xorg-video-amdgpu (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "lspci.txt"
   https://bugs.launchpad.net/bugs/1597079/+attachment/4691887/+files/lspci.txt

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https://bugs.launchpad.net/bugs/1597079

Title:
  AMDGPU Black Screen when Booting

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