There is a new patchset switches to use EDID-based DP quirk to list those DPCD
backlight panel.
I'll try verifying the new method and submit new SRU patches.
https://patchwork.kernel.org/cover/11376657/
** Changed in: linux-5.4 (Ubuntu Focal)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1861521
Title:
[FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled
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