This happens regularly to me too.

$ uname -a
Linux ionian 5.4.0-54-generic #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020 x86_64 
x86_64 x86_64 GNU/Linux

Ubuntu 20.04.

▐$ sudo dpkg -l | grep xserver-xorg-video
ii  xserver-xorg-video-all                                1:7.7+19ubuntu14      
                      amd64        X.Org X server -- output driver metapackage
ii  xserver-xorg-video-amdgpu                             19.1.0-1              
                      amd64        X.Org X server -- AMDGPU display driver
ii  xserver-xorg-video-ati                                1:19.1.0-1            
                      amd64        X.Org X server -- AMD/ATI display driver 
wrapper
ii  xserver-xorg-video-fbdev                              1:0.5.0-1ubuntu1      
                      amd64        X.Org X server -- fbdev display driver
ii  xserver-xorg-video-intel                              
2:2.99.917+git20200226-1                    amd64        X.Org X server -- 
Intel i8xx, i9xx display driver
rc  xserver-xorg-video-modesetting                        0.9.0-1build1         
                      amd64        X.Org X server -- Generic modesetting driver
ii  xserver-xorg-video-nouveau                            1:1.0.16-1            
                      amd64        X.Org X server -- Nouveau display driver
ii  xserver-xorg-video-openchrome                         1:0.6.0-3build1       
                      amd64        X.Org X server -- OpenChrome display driver
ii  xserver-xorg-video-qxl                                0.1.5+git20200331-1   
                      amd64        X.Org X server -- QXL display driver
ii  xserver-xorg-video-radeon                             1:19.1.0-1            
                      amd64        X.Org X server -- AMD/ATI Radeon display 
driver
ii  xserver-xorg-video-vesa                               1:2.4.0-2             
                      amd64        X.Org X server -- VESA display driver
ii  xserver-xorg-video-vmware                             1:13.3.0-3            
                      amd64        X.Org X server -- VMware display driver


journalctl gives this at the start of the crash. I coincides with starting 
Slack (the chat program, it uses google-chrome):

Dec 09 08:56:07 ionian kernel: radeon 0000:01:00.0: ring 0 stalled for more 
than 10156msec
Dec 09 08:56:07 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000010df8 last fence id 0x0000000000010e00 on ring 0)
Dec 09 08:56:08 ionian kernel: radeon 0000:01:00.0: ring 3 stalled for more 
than 10216msec
Dec 09 08:56:08 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000002eef last fence id 0x0000000000002ef1 on ring 3)
Dec 09 08:56:08 ionian kernel: radeon 0000:01:00.0: ring 0 stalled for more 
than 10664msec
Dec 09 08:56:08 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000010df8 last fence id 0x0000000000010e00 on ring 0)
Dec 09 08:56:08 ionian kernel: radeon 0000:01:00.0: ring 3 stalled for more 
than 10728msec
Dec 09 08:56:08 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000002eef last fence id 0x0000000000002ef1 on ring 3)
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: ring 0 stalled for more 
than 11176msec
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000010df8 last fence id 0x0000000000010e00 on ring 0)
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: ring 3 stalled for more 
than 11240msec
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000002eef last fence id 0x0000000000002ef1 on ring 3)
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: ring 0 stalled for more 
than 11688msec
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000010df8 last fence id 0x0000000000010e00 on ring 0)
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: ring 3 stalled for more 
than 11756msec
Dec 09 08:56:09 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000002eef last fence id 0x0000000000002ef1 on ring 3)
Dec 09 08:56:10 ionian kernel: radeon 0000:01:00.0: ring 0 stalled for more 
than 12200msec
Dec 09 08:56:10 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000010df8 last fence id 0x0000000000010e00 on ring 0)
Dec 09 08:56:10 ionian /usr/lib/gdm3/gdm-x-session[5666]: [12/09/20, 
08:56:10:433] info: [ACTION:CHANNEL-SIDEBAR] Selected GFFT85V5M

After a while it goes in a loop like this, and the symptoms are the same
as OP, no response from keyboard, screen freeze. The sound from my web
meeting was still going though, if with some hickups (probably in phase
with the radeon errors):

Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: GPU reset succeeded, trying 
to resume
Dec 09 08:56:18 ionian kernel: [drm] PCIE gen 2 link speeds already enabled
Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: Wait for MC idle timedout !
Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: Wait for MC idle timedout !
Dec 09 08:56:18 ionian kernel: [drm] PCIE GART of 1024M enabled (table at 
0x000000000014C000).
Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: WB enabled
Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: fence driver on ring 0 use 
gpu addr 0x0000000040000c00 and cpu addr 0x000000009ed2883c
Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: fence driver on ring 3 use 
gpu addr 0x0000000040000c0c and cpu addr 0x00000000c6312e78
Dec 09 08:56:18 ionian kernel: radeon 0000:01:00.0: fence driver on ring 5 use 
gpu addr 0x000000000005c418 and cpu addr 0x0000000009b8d531
Dec 09 08:56:18 ionian kernel: [drm:r600_ring_test [radeon]] *ERROR* radeon: 
ring 0 test failed (scratch(0x8504)=0xCAFEDEAD)
Dec 09 08:56:18 ionian kernel: [drm:evergreen_resume [radeon]] *ERROR* 
evergreen startup failed on resume
Dec 09 08:56:28 ionian kernel: radeon 0000:01:00.0: ring 0 stalled for more 
than 10176msec
Dec 09 08:56:28 ionian kernel: radeon 0000:01:00.0: GPU lockup (current fence 
id 0x0000000000010df8 last fence id 0x0000000000010e18 on ring 0)
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0: Saved 98855 dwords of 
commands on ring 0.
Dec 09 08:56:29 ionian kernel: snd_hda_intel 0000:00:1b.0: Unstable LPIB (29688 
>= 8192); disabling LPIB delay counting
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0: GPU softreset: 0x0000001D
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   GRBM_STATUS               
= 0xA0003828
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   GRBM_STATUS_SE0           
= 0x00000007
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   GRBM_STATUS_SE1           
= 0x00000007
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   SRBM_STATUS               
= 0x200006C0
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   SRBM_STATUS2              
= 0x00000000
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 
= 0x00000000
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 
= 0x00010002
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     
= 0x00020182
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   R_008680_CP_STAT          
= 0x80038243
Dec 09 08:56:29 ionian kernel: radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   
= 0x44C83D57
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0: Wait for MC idle timedout !
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0: GRBM_SOFT_RESET=0x00007F6B
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00100100
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   GRBM_STATUS               
= 0x00003828
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   GRBM_STATUS_SE0           
= 0x00000007
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   GRBM_STATUS_SE1           
= 0x00000007
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   SRBM_STATUS               
= 0x200006C0
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   SRBM_STATUS2              
= 0x00000000
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 
= 0x00000000
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 
= 0x00000000
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     
= 0x00000000
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   R_008680_CP_STAT          
= 0x00000000
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   
= 0x44C83D57
Dec 09 08:56:30 ionian kernel: radeon 0000:01:00.0: GPU reset succeeded, trying 
to resume

HD5770

Anything more I could send? Or do to fix it?

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https://bugs.launchpad.net/bugs/1863390

Title:
  GPU lockup ring 0 stalled for more than X msec

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