I have it too: (random hangups of whole system either under load/idle)
- Ryzen5 2400 G
- Ubuntu 18.04
- kernel 4.18

$ sudo lshw -c video
  *-display                 
       description: VGA compatible controller
       product: Advanced Micro Devices, Inc. [AMD/ATI]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:0b:00.0
       version: c6
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix vga_controller bus_master cap_list 
rom
       configuration: driver=amdgpu latency=0
       resources: irq:88 memory:e0000000-efffffff memory:f0000000-f01fffff 
ioport:d000(size=256) memory:fe300000-fe37ffff memory:c0000-dfff

$ $ lspci -v
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15d0
        Subsystem: ASUSTeK Computer Inc. Device 876b
        Flags: fast devsel

00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 15d1
        Subsystem: Advanced Micro Devices, Inc. [AMD] Device 15d1
        Flags: bus master, fast devsel, latency 0, IRQ 27
        Capabilities: <access denied>

00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 
00h-0fh) PCIe Dummy Host Bridge
        Flags: fast devsel

00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 (prog-if 00 
[Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 28
        Bus: primary=00, secondary=01, subordinate=09, sec-latency=0
        I/O behind bridge: 0000e000-0000efff
        Memory behind bridge: fe400000-fe7fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

00:01.6 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 (prog-if 00 
[Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Bus: primary=00, secondary=0a, subordinate=0a, sec-latency=0
        Memory behind bridge: fe900000-fe9fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 
00h-0fh) PCIe Dummy Host Bridge
        Flags: fast devsel

00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15db (prog-if 00 
[Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 26
        Bus: primary=00, secondary=0b, subordinate=0b, sec-latency=0
        I/O behind bridge: 0000d000-0000dfff
        Memory behind bridge: fe000000-fe3fffff
        Prefetchable memory behind bridge: 00000000e0000000-00000000f01fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15dc (prog-if 00 
[Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 26
        Bus: primary=00, secondary=0c, subordinate=0c, sec-latency=0
        Memory behind bridge: fe800000-fe8fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
        Subsystem: ASUSTeK Computer Inc. FCH SMBus Controller
        Flags: 66MHz, medium devsel
        Kernel driver in use: piix4_smbus
        Kernel modules: i2c_piix4, sp5100_tco

00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
        Subsystem: ASUSTeK Computer Inc. FCH LPC Bridge
        Flags: bus master, 66MHz, medium devsel, latency 0

00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e8
        Flags: fast devsel

00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e9
        Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ea
        Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15eb
        Flags: fast devsel
        Kernel driver in use: k10temp
        Kernel modules: k10temp

00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ec
        Flags: fast devsel

00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ed
        Flags: fast devsel

00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ee
        Flags: fast devsel

00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ef
        Flags: fast devsel

01:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43d0 (rev 01) 
(prog-if 30 [XHCI])
        Subsystem: ASMedia Technology Inc. Device 1142
        Flags: bus master, fast devsel, latency 0, IRQ 42
        Memory at fe7a0000 (64-bit, non-prefetchable) [size=32K]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd

01:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43c8 (rev 
01) (prog-if 01 [AHCI 1.0])
        Subsystem: ASMedia Technology Inc. Device 1062
        Flags: bus master, fast devsel, latency 0, IRQ 85
        Memory at fe780000 (32-bit, non-prefetchable) [size=128K]
        Expansion ROM at fe700000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: ahci
        Kernel modules: ahci

01:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c6 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 30
        Bus: primary=01, secondary=02, subordinate=09, sec-latency=0
        I/O behind bridge: 0000e000-0000efff
        Memory behind bridge: fe400000-fe6fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 31
        Bus: primary=02, secondary=03, subordinate=03, sec-latency=0
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 32
        Bus: primary=02, secondary=04, subordinate=04, sec-latency=0
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:03.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 34
        Bus: primary=02, secondary=05, subordinate=05, sec-latency=0
        Memory behind bridge: fe600000-fe6fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 35
        Bus: primary=02, secondary=06, subordinate=06, sec-latency=0
        Memory behind bridge: fe500000-fe5fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 36
        Bus: primary=02, secondary=07, subordinate=07, sec-latency=0
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 37
        Bus: primary=02, secondary=08, subordinate=08, sec-latency=0
        I/O behind bridge: 0000e000-0000efff
        Memory behind bridge: fe400000-fe4fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport

02:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43c7 (rev 01) 
(prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 39
        Bus: primary=02, secondary=09, subordinate=09, sec-latency=0
        Capabilities: <access denied>
        Kernel driver in use: pcieport

05:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
        Subsystem: Intel Corporation Dual Band Wireless-AC 8260
        Flags: bus master, fast devsel, latency 0, IRQ 94
        Memory at fe600000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: <access denied>
        Kernel driver in use: iwlwifi
        Kernel modules: iwlwifi

06:00.0 USB controller: ASMedia Technology Inc. ASM1142 USB 3.1 Host Controller 
(prog-if 30 [XHCI])
        Subsystem: ASUSTeK Computer Inc. ASM1142 USB 3.1 Host Controller
        Flags: bus master, fast devsel, latency 0, IRQ 25
        Memory at fe500000 (64-bit, non-prefetchable) [size=32K]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd

08:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network Connection 
(rev 03)
        Subsystem: ASUSTeK Computer Inc. I211 Gigabit Network Connection
        Flags: bus master, fast devsel, latency 0, IRQ 33
        Memory at fe400000 (32-bit, non-prefetchable) [size=128K]
        I/O ports at e000 [size=32]
        Memory at fe420000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: igb
        Kernel modules: igb

0a:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a808 
(prog-if 02 [NVM Express])
        Subsystem: Samsung Electronics Co Ltd Device a801
        Flags: bus master, fast devsel, latency 0, IRQ 40, NUMA node 0
        Memory at fe900000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: nvme

0b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Vega 
[Radeon Vega 8 Mobile] (rev c6) (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Vega [Radeon Vega 8 Mobile]
        Flags: bus master, fast devsel, latency 0, IRQ 88
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f0000000 (64-bit, prefetchable) [size=2M]
        I/O ports at d000 [size=256]
        Memory at fe300000 (32-bit, non-prefetchable) [size=512K]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu

0b:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 15de
        Subsystem: ASUSTeK Computer Inc. Device 876b
        Flags: bus master, fast devsel, latency 0, IRQ 96
        Memory at fe388000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

0b:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 15df
        Subsystem: Advanced Micro Devices, Inc. [AMD] Device 15df
        Flags: bus master, fast devsel, latency 0, IRQ 15
        Memory at fe200000 (32-bit, non-prefetchable) [size=1M]
        Memory at fe38c000 (32-bit, non-prefetchable) [size=8K]
        Capabilities: <access denied>

0b:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e0 (prog-if 
30 [XHCI])
        Subsystem: ASUSTeK Computer Inc. Device 876b
        Flags: bus master, fast devsel, latency 0, IRQ 51
        Memory at fe100000 (64-bit, non-prefetchable) [size=1M]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd

0b:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e1 (prog-if 
30 [XHCI])
        Subsystem: ASUSTeK Computer Inc. Device 876b
        Flags: bus master, fast devsel, latency 0, IRQ 60
        Memory at fe000000 (64-bit, non-prefetchable) [size=1M]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd

0b:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Device 15e3
        Subsystem: ASUSTeK Computer Inc. Device 8733
        Flags: bus master, fast devsel, latency 0, IRQ 97
        Memory at fe380000 (32-bit, non-prefetchable) [size=32K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

0c:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller 
[AHCI mode] (rev 61) (prog-if 01 [AHCI 1.0])
        Subsystem: ASUSTeK Computer Inc. FCH SATA Controller [AHCI mode]
        Flags: bus master, fast devsel, latency 0, IRQ 87
        Memory at fe800000 (32-bit, non-prefetchable) [size=2K]
        Capabilities: <access denied>
        Kernel driver in use: ahci
        Kernel modules: ahci


$ uname -a
Linux elrond 4.18.20-041820-generic #201812030624 SMP Mon Dec 3 11:25:55 UTC 
2018 x86_64 x86_64 x86_64 GNU/Linux

$ dmesg | grep drm
[    1.641459] [drm] amdgpu kernel modesetting enabled.
[    1.645616] fb: switching to amdgpudrmfb from EFI VGA
[    1.645835] [drm] initializing kernel modesetting (RAVEN 0x1002:0x15DD 
0x1043:0x876B 0xC6).
[    1.645844] [drm] register mmio base: 0xFE300000
[    1.645845] [drm] register mmio size: 524288
[    1.645851] [drm] probing gen 2 caps for device 1022:15db = 700d03/e
[    1.645853] [drm] probing mlw for device 1022:15db = 700d03
[    1.645855] [drm] add ip block number 0 <soc15_common>
[    1.645856] [drm] add ip block number 1 <gmc_v9_0>
[    1.645856] [drm] add ip block number 2 <vega10_ih>
[    1.645857] [drm] add ip block number 3 <psp>
[    1.645857] [drm] add ip block number 4 <powerplay>
[    1.645858] [drm] add ip block number 5 <dm>
[    1.645859] [drm] add ip block number 6 <gfx_v9_0>
[    1.645859] [drm] add ip block number 7 <sdma_v4_0>
[    1.645860] [drm] add ip block number 8 <vcn_v1_0>
[    1.645889] [drm] VCN decode is enabled in VM mode
[    1.645890] [drm] VCN encode is enabled in VM mode
[    1.669303] [drm] BIOS signature incorrect 0 0
[    1.669348] [drm] vm size is 262144 GB, 4 levels, block size is 9-bit, 
fragment size is 9-bit
[    1.669358] [drm] Detected VRAM RAM=1024M, BAR=1024M
[    1.669359] [drm] RAM width 128bits DDR4
[    1.669466] [drm] amdgpu: 1024M of VRAM memory ready
[    1.669467] [drm] amdgpu: 3072M of GTT memory ready.
[    1.669473] [drm] GART: num cpu pages 262144, num gpu pages 262144
[    1.669634] [drm] PCIE GART of 1024M enabled (table at 0x000000F400900000).
[    1.670752] [drm] use_doorbell being set to: [true]
[    1.670839] [drm] Found VCN firmware Version: 1.73 Family ID: 18
[    1.670841] [drm] PSP loading VCN firmware
[    1.843030] [drm] Display Core initialized with v3.1.44!
[    1.868553] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.868554] [drm] Driver supports precise vblank timestamp query.
[    1.891323] [drm] VCN decode and encode initialized successfully.
[    1.892629] [drm] fb mappable at 0xA1100000
[    1.892630] [drm] vram apper at 0xA0000000
[    1.892630] [drm] size 8294400
[    1.892630] [drm] fb depth is 24
[    1.892631] [drm]    pitch is 7680
[    1.892683] fbcon: amdgpudrmfb (fb0) is primary device
[    1.950133] amdgpu 0000:0b:00.0: fb0: amdgpudrmfb frame buffer device
[    1.966332] [drm] Initialized amdgpu 3.26.0 20150101 for 0000:0b:00.0 on 
minor 0

$ cat /sys/class/drm/card0/device/pp_dpm_sclk
0: 200Mhz 
1: 400Mhz *
2: 1250Mhz  

Log: /var/log/syslog (or kern.log) juts before the freeze, after which
only har reset, power off/on makes ysstem boot agian:

Jan 15 02:34:13 elrond kernel: [  476.185425] gmc_v9_0_process_interrupt: 32 
callbacks suppressed
Jan 15 02:34:13 elrond kernel: [  476.185429] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 v
mid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185433] amdgpu 0000:0b:00.0:   at page 
0x000000010780a000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185434] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00301031
Jan 15 02:34:13 elrond kernel: [  476.185440] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 v
mid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185441] amdgpu 0000:0b:00.0:   at page 
0x000000010780b000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185443] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185448] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 v
mid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185449] amdgpu 0000:0b:00.0:   at page 
0x0000000107805000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185450] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185455] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185457] amdgpu 0000:0b:00.0:   at page 
0x0000000107806000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185458] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185463] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185464] amdgpu 0000:0b:00.0:   at page 
0x0000000107808000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185465] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185470] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185471] amdgpu 0000:0b:00.0:   at page 
0x0000000107809000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185473] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185478] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185479] amdgpu 0000:0b:00.0:   at page 
0x0000000107803000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185480] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185485] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185486] amdgpu 0000:0b:00.0:   at page 
0x0000000107804000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185487] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185492] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185493] amdgpu 0000:0b:00.0:   at page 
0x0000000107809000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185494] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:13 elrond kernel: [  476.185500] amdgpu 0000:0b:00.0: [gfxhub] VMC 
page fault (src_id:0 ring:24 vmid:3 pasid:32768)
Jan 15 02:34:13 elrond kernel: [  476.185501] amdgpu 0000:0b:00.0:   at page 
0x0000000107808000 from 27
Jan 15 02:34:13 elrond kernel: [  476.185502] amdgpu 0000:0b:00.0: 
VM_L2_PROTECTION_FAULT_STATUS:0x00000000
Jan 15 02:34:23 elrond kernel: [  486.421830] [drm:amdgpu_job_timedout 
[amdgpu]] *ERROR* ring gfx timeout, last signaled seq=41331, last emitted 
seq=41333
Jan 15 02:34:23 elrond kernel: [  486.421834] [drm] GPU recovery disabled.

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Title:
  Kubuntu 18.04.01 - Ryzen 2400G / AMDGPU - Random system freezes

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