[Bug 100979] Radeon r4 on a6-6310(BEEMA) APU hard lockup on hibernate and on second resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100979

--- Comment #13 from Przemek <soprwa at gmail.com> ---
Using the opportunity that I was working on another bug report with AMD DC
kernel driver, and have git cloned agd5f drm-next-4.17-wip branch, I have tried
to debug the situation on hibernate process with this experimental kernel also.

This time hibernation image is created, and laptop turns off after that.

But - during the hibernation process screen goes totally white, process take
approximately 15-20 seconds on ssd drive before netbook gets power-off.

During resume hibernation image is read (it is possible to see percentage) and
then screen goes white, and machine is in a locked-up state. I can do nothing
but press power button to hard-reset the netbook.

Moreover I foud only once an error message in kernel log:

"Mar 28 01:36:54 eclipse kernel: [   86.665473]
[drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:39:crtc-0] flip_done
timed out
Mar 28 01:36:54 eclipse kernel: [   86.828685] [drm:gfx_v7_0_ring_test_ring]
*ERROR* amdgpu: ring 0 test failed (scratch(0xC040)=0xCAFEDEAD)
Mar 28 01:36:54 eclipse kernel: [   86.828698]
[drm:amdgpu_device_ip_resume_phase2] *ERROR* resume of IP block <gfx_v7_0>
failed -22
Mar 28 01:36:54 eclipse kernel: [   86.828703] [drm:amdgpu_device_resume]
*ERROR* amdgpu_device_ip_resume failed (-22).
Mar 28 01:36:54 eclipse kernel: [   86.828718] dpm_run_callback():
pci_pm_restore+0x0/0xa0 returns -22
Mar 28 01:36:54 eclipse kernel: [   86.828742] PM: Device 0000:00:01.0 failed
to restore async: error -22"

of course I am unable to reproduce it. I am not sure how much it is related but
this could be usefull, tough.

Kernel was booted up with amdgpu.dc=1.

Any help is appreciated.

Thanks,
Przemek.

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