https://bugs.kde.org/show_bug.cgi?id=495819

--- Comment #15 from Jon List <jon.list.a...@gmail.com> ---
> As an Arch user, you have access to the AUR and could try the development
> version at https://aur.archlinux.org/packages/ddcutil-git - I just gave it a
> shot and it solved a few issues (different ones) for me as well.
> 
> Please report back if this makes a difference for you.

My external monitor connected via Thunderbolt <-> Dock <-> HDMI was working in
terms of controlling both displays brightness
but laptop wakeup often required reconnecting the Thunderbolt cable, or if not
then there was a few too many rounds of crashes and resetting the connection
before I had both displays working.

ddcutil-git improved things here with the power cycling before successful
connection

Thanks everybody

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