This script will enumerate processes hogging DS4 device stream handle, try to free the handle by temporarily unloading known hogs detected running, start DS4W and load the unloaded hogs back.

DS4W-Saufeder.rb

# Ruby 2.6.6
# PowerShell 7.1
# SysInternals Handle 4.22
# DS4W 2.1.8

require 'set'

$task_heap = Set.new

if (ARGV & ['--help', '-h']).any?
  puts "This script will enumerate processes hogging DS4 device stream handle,
try to free the handle by temporarily unloading known hogs detected running,
start DS4W and load the unloaded hogs back.

Commands (multiple allowed, combining isn't):
\e[33m--help\e[0m or \e[33m-h\e[0m    To print this help message and unload.
\e[33m-nv-on\e[0m          To start NvContainerLocalSystem service and unload.
\e[33m-nv-off\e[0m         To stop NvContainerLocalSystem service before continuing.
\e[33m-s-on\e[0m           To start Steam and unload.
\e[33m-s-off\e[0m          To terminate Steam before continuing.
\e[33m--manual\e[0m or \e[33m-m\e[0m  To only enumerage and unload. Overrides other commands.
\e[33m--quick\e[0m or \e[33m-q\e[0m   To skip precautions."
  return
end
if (ARGV & ['--manual', '-m']).any?
  $task_heap.add ?m
else
  if ARGV.include? '-nv-on'
    load_nv
    $task_heap.add ?l
  elsif ARGV.include? '-nv-off'
    unload_nv
  end
    
  if ARGV.include? '-s-on'
    load_steam
    $task_heap.add ?l
  elsif ARGV.include? '-s-off'
    unload_steam
  end
  
  if (ARGV & ['--quick', '-q']).any?
    $task_heap.add ?W
  else
    $task_heap.add ?w
  end
  $task_heap.add ?e
end

def unload_steam
  system 'powershell Stop-Process -Name "steam"'
end

def load_steam
  system ('powershell Start-Process -FilePath ' + `powershell (Get-ItemProperty -Path "HKLM:\\SOFTWARE\\Wow6432Node\\Valve\\Steam").InstallPath`.chomp + '\steam.exe -ArgumentList "-silent"')
end

def unload_nv
  system 'powershell Stop-Service "NvContainerLocalSystem"'
end

def load_nv
  system 'powershell Start-Service "NvContainerLocalSystem"'
end

def load_ds4w
  system ('powershell Start-Process -FilePath E:\Programs\Emulators\DS4Windows\DS4Windows.exe')
end

PS_script = "Get-PnpDevice -Class 'HIDClass' `
-InstanceId 'HID\\VID_054C&PID_0BA0*' -PresentOnly |
Get-PnpDeviceProperty -KeyName 'DEVPKEY_Device_PDOName' |
Select-Object -ExpandProperty 'Data' |
Format-Table -HideTableHeaders".gsub! /((?: `)?\n)/, ' '

def flush_bush string_bush
  if string_bush[:branches].size > 0
    puts string_bush[:root], string_bush[:branches]
    
    if string_bush[:root].downcase.include? "steam"
      $task_heap.add ?s
    elsif string_bush[:root].downcase.include? "system"
      $task_heap.add ?n
    elsif string_bush[:root].downcase.include? "dwm"
      $task_heap.add ?d
    else
      $task_heap.add ?p
    end
  end
end

def enumerate_hogging_processes
  IO.popen('powershell -nologo', 'r+') do |stream|
    stream.puts './handle64 -nobanner -a', 'Exit'
    string_bush = {root: '', branches: []}
    while in_line = stream.gets do
      if !!(matches = /^(.+?) pid\: (\d+)/.match in_line)
        # Process node
        flush_bush string_bush
        string_bush[:root] = in_line
        string_bush[:branches] = []
      elsif !!(matches = /^ +?(\w+?)\: File .*? (#{Regexp.quote(Device_handle)})/.match in_line)
        # Device handle node
        string_bush[:branches] << in_line
      end
    end
    flush_bush string_bush
  end
end

def process_task_heap
  until $task_heap.empty?
    if $task_heap.include? ?l
      puts 'No enumeration after loading programs.'
      $task_heap = $task_heap & [?S, ?N]
    end
    if $task_heap.include? ?m
      puts 'Manual mode engaged. Enumerating only.'
      $task_heap = [?e].to_set
    end
    if $task_heap.include? ?e
      enumerate_hogging_processes
      $task_heap.delete ?e
    end
    if $task_heap.include? ?p
      puts 'Panic: not an automated case.'
      return
    end
    if $task_heap.include? ?d
      puts "Ignoring DWM. It doesn't tend to interfere."
      $task_heap.delete ?d
    end
    if $task_heap.include? ?s
      puts 'Temporarily unloading Steam.'
      unload_steam
      $task_heap.add ?S
      $task_heap.delete ?s
    end
    if $task_heap.include? ?n
      puts 'Temporarily unloading NvContainerLocalSystem.'
      unload_nv
      $task_heap.add ?N
      $task_heap.delete ?n
    end
    if ($task_heap & [?w, ?W]).any?
      puts 'Loading DS4W.'
      load_ds4w
      if $task_heap.include? ?w
        puts 'Turn on the controller, switch back here and press [ENTER].',
          'This is a precautionary measure.' ,
          "If you are certain it isn't required — hit [ENTER] immediately.",
          'We still might have temporarily-unloaded programs to load back up.'
        system 'PAUSE'
      end
      $task_heap = $task_heap ^ ($task_heap & [?w, ?W])
    end
    if $task_heap.include? ?S
      puts 'Loading Steam back.'
      load_steam
      $task_heap.delete ?S
    elsif $task_heap.include? ?N
      puts 'Loading NvContainerLocalSystem back.'
      load_nv
      $task_heap.delete ?N
    end
  end
end

IO.popen('powershell -nologo', 'r+') do |stream|
  out_string = String.new
  stream.puts PS_script, 'Exit'
  while in_line = stream.gets do
    out_string << in_line
  end
  Device_handle = out_string.split("\n")[-2]
end
puts 'Device handle: ' + Device_handle, 'Users:'

process_task_heap