Public bug reported:

I'm not an expert on Linux, so please point to what more info you need.

Thing is, recently I bought and built a new PC configuration, after this error 
started showing up and my old PC went away (didn't have any probs until this 
happened, and suddenly, faulty memory modules when I ran memtest).
The problem started sometime around kernel update 4.15.0-8 and 4.15.0-14 
(something like that).


Whilst rebuilding PC I left my graphics card (sapphire AMD r9 380) and power 
supply.
And this problem keeps happening again, so I'm worrying it will affect other 
components eventually.

My configuration is:
MSI B450 Tomahawk
Kingston 16 GB, HyperX Predator
AMD Ryzen 1700
AMD r9 380

Description:    KDE neon User Edition 5.15
Release:        18.04

Kernel (which I updated using UKUU): 
Linux neon-home 4.20.17-042017-generic #201903190933 SMP Tue Mar 19 13:36:11 
UTC 2019 x86_64 x86_64 x86_64 GNU/Linux


When I run journalctl -b -1 (upon restarting/shutdown) it's red on these lines 
(closest to when the freeze happens)

may 04 21:48:59 home-pc kernel: [drm:drm_atomic_helper_wait_for_dependencies 
[drm_kms_helper]] *ERROR* [CRTC:44:crtc-0] flip_done timed out 
may 04 21:49:09 home-pc kernel: [drm:drm_atomic_helper_wait_for_dependencies 
[drm_kms_helper]] *ERROR* [PLANE:42:plane-5] flip_done timed out 
may 04 21:49:09 home-pc kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] 
*ERROR* amdgpu_dm_commit_planes: acrtc 0, already busy 
may 04 21:49:09 home-pc kernel: WARNING: CPU: 6 PID: 1547 at 
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4458 
amdgpu_dm_atomic_commit_tail+0xba9/0xe20 [amdgpu] 
may 04 21:49:09 home-pc kernel: Modules linked in: ccm pci_stub vboxpci(OE) 
vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) arc4 edac_mce_amd kvm_amd kvm 
irqbypass rt2800usb snd_hda_codec_realtek rt2x00usb snd_hda_codec_generic 
rt2800lib sn 
may 04 21:49:09 home-pc kernel:  ahci realtek libahci wmi gpio_amdpt 
gpio_generic

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1827737

Title:
  KDE Neon (18.04 LTS) freezes randomly, hard shutdown required

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