*** 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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