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There is a plan to add DDC to the Linux kernel, so that any desktop can manage external monitors using the same APIs they use to manage internal laptop panels. Hopefully that would mitigate the problems you mention.

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https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux

Using this driver, Powerdevil does not allow you to set values individually per monitor, instead gives you only a single slider. This is absolutely sufficient for single monitor or multi monitor setups with identical models, but in my case I need the option to set it individually since my monitors are all differently bright on 100%.

See my comment above, per-display brightness config will need changes to the Linux kernel brightness userspace API.

Yeah. There was an attempt to upstream that driver (by someone not involved in it), and the need for a better userspace API for backlight control got mentioned, so the driver wasn't merged. Probably a better driver will get merged eventually.

https://lore.kernel.org/all/7f2d88de-60c5-e2ff-9b22-acba35cf...

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