Smooth brightness control

[Peiprjs]

Please describe your feature request

I would quite like to see the brightness control be more smooth rather than directly to brightness. Maybe a sigmoid change could be nice.

[maximbaz]

It is in fact smooth, but what I only recently realized is that this heavily depends on your system's ability to make fast changes to the brightness. Most notably, if you give wluma direct access to the driver, then this seems to work very well and smooth on the laptops that I owned over the past years, while if wluma has to fallback to change brightness via systemd, then systemd seems to throttle this - wluma sends "change brightness from 100 to 99 to 98 to 97", systemd acknowledges all that, does nothing, and then some milliseconds later changes brightness once, directly from 100 to 97.

If you already use direct access to driver, there might be more to this, for example if driver itself is somehow "slow" 🤔 - a clear example of that would be external displays via DDC, I think those are just inherently super slow.

What's your current setup?

[maximbaz]

Closing, but do feel free to post here if you have more questions or findings.