Public bug reported:

i updated today to linux kernel 5.4.0-66-generic.
since then the monitor (HDMI) remains black when switched off and on again.
this can be corrected once, if a virtual text console hasn't been used so far 
by switching to a virtual text console and then back to the desktop. 

Ubuntu 5.4.0-66.74-generic 5.4.86  (Linux Mint 20, Cinnamon 4.6.7)
lspci-vnvn.log attached

Asrock DeskMini A300
AMD Ryzen 5 2400G with Radeon Vega Graphics × 4
Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon 
Vega Mobile Series]

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

** Attachment added: "lspci-vnvn.log"
   
https://bugs.launchpad.net/bugs/1916919/+attachment/5467067/+files/lspci-vnvn.log

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https://bugs.launchpad.net/bugs/1916919

Title:
  after upgrade to 5.4.0-66 monitor remains black after off/on cycle

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  i updated today to linux kernel 5.4.0-66-generic.
  since then the monitor (HDMI) remains black when switched off and on again.
  this can be corrected once, if a virtual text console hasn't been used so far 
by switching to a virtual text console and then back to the desktop. 

  Ubuntu 5.4.0-66.74-generic 5.4.86  (Linux Mint 20, Cinnamon 4.6.7)
  lspci-vnvn.log attached

  Asrock DeskMini A300
  AMD Ryzen 5 2400G with Radeon Vega Graphics × 4
  Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / 
Radeon Vega Mobile Series]

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