[Bug 216119] 087451f372bf76d breaks hibernation on amdgpu Radeon R9 390

[bugzilla-daemon at kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216119

--- Comment #25 from Harald Judt (h.judt at gmx.at) ---
Created attachment 301298
  --> https://bugzilla.kernel.org/attachment.cgi?id=301298&action=edit
dmesg.out

I report success, partly.

Setting amdgpu.dc=0 on the kernel command line also exhibits the behaviour =>
Screen suspended, comes back after a while, goes blank again (but powered on),
also keyboard back for sysreq, but ssh unresponsive.

After applying patch 4 and setting amdgpu.dc=0, the system restores again, but
not smoothly. Screen suspends, comes back after a while, also keyboard, display
switches back on, machine is responsive and I could generate a dmesg which
shows that there have been test failures. dmesg.out attached, but the relevant
messages are these:

amdgpu 0000:01:00.0: [drm:amdgpu_ib_ring_tests] *ERROR* IB test failed on sdma0
(-110).
[drm:process_one_work] *ERROR* ib ring test failed (-110).

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