FWIW I'm seeing this on a XPS 13 9370 as well
cwayne@groot:~$ glxinfo |grep Device
Device: Mesa Intel(R) UHD Graphics 620 (KBL GT2) (0x5917)
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https://bugs.launchpad.net/bugs/1861521
Title:
[FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled
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