Ubuntu-5.3.0-54.48 will fix it:
commit adfa5c21954fc496c64b5c492bd95d9e18c0d33f
Author: Prike Liang <prike.li...@amd.com>
Date:   Mon Apr 13 21:41:14 2020 +0800

    drm/amdgpu: fix the hw hang during perform system reboot and reset
    
    BugLink: https://bugs.launchpad.net/bugs/1876321
    
    commit b2a7e9735ab2864330be9d00d7f38c961c28de5d upstream.
    
    The system reboot failed as some IP blocks enter power gate before perform
    hw resource destory. Meanwhile use unify interface to set device CGPG to 
ungate
    state can simplify the amdgpu poweroff or reset ungate guard.
    
    Fixes: 487eca11a321ef ("drm/amdgpu: fix gfx hang during suspend with video 
playback (v2)")
    Signed-off-by: Prike Liang <prike.li...@amd.com>
    Tested-by: Mengbing Wang <mengbing.w...@amd.com>
    Tested-by: Paul Menzel <pmen...@molgen.mpg.de>
    Acked-by: Alex Deucher <alexander.deuc...@amd.com>
    Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
    Cc: sta...@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
    Signed-off-by: Kamal Mostafa <ka...@canonical.com>
    Signed-off-by: Kleber Sacilotto de Souza <kleber.so...@canonical.com>

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https://bugs.launchpad.net/bugs/1879997

Title:
  HP-255-G7-Notebook-PC 5.3.0-51-generic

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  HP-255-G7-Notebook-PC System wont reboot or shutdown after kernel
  5.3.0-53 update

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