*** This bug is a duplicate of bug 1831587 ***
    https://bugs.launchpad.net/bugs/1831587

Yeah, OLEDs do not have a backlight so the standard 'backlight' kernel
controls won't work.

Indeed 'xrandr --brightness' is the only workaround I know of.

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https://bugs.launchpad.net/bugs/1872327

Title:
  OLED brightness control on Intel Iris Plus Graphics G7

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