ddcutil in Plasma Powerdevil

[Dorian Vogel]

Hey Jonathan,
Unfortunately I did not test it for a long time (last time was around
5.15), and don't really have the possibility now because I'm away from home.
*If I remember correctly,* back then I had a few instances when the startup
of plasma (during the splashscreen) was quite longer due to retries of the
DDC communication (of course this will not happen if the user does not have
ddcutil itself installed). As I understand it, this is due to the
architecture of Powerdevil, which assumes the monitors are a fixed
configuration as far as brightness is concerned: backends are queried at
startup and never refreshed. This is why enumeration has to happen during
startup of plasma, and one would have to restart powerdevil when connecting
a new DDC capable monitor

Thinking back I wonder if a plasmoid would have been a better way, enabling
to have the enumeration done after startup is finished, and making it
easier to have a "refresh" button, and would still allow to have both an
integrated screen (laptop) and external (for now the backends in powerdevil
are exclusive).

Considering this is my first contribution and I am not sure of the quality,
I think some testing from more experienced devs would be required. I
haven't heard much so far.

Cheers,
*Dorian*

On Thu, Sep 26, 2019 at 11:13 AM Jonathan Riddell <jr at jriddell.org> wrote:

> The DDCUtil features of Powerdevil in KDE Plasma are currently disabled by
> default
> "DDCUtil library support is disabled by default as recomended by authors,
> add -DHAVE_DDCUTIL=On to enable"
> This is based on a conversation from 2017 where it was decided it was
> unstable.
>
> I see work has continued on DDCUtil and on support for it in Powerdevil.
> Is it ready to be set to on by default?
>
> It is too late for Plasma 5.17 due for release in 2 weeks but we can tell
> distros the message is old as appropriate.
>
> Jonathan
>
>

-- 
VOGEL Dorian
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