Meeting (BOF) at Plumbers Dublin to discuss backlight brightness as connector object property RFC?

Daniel Stone daniel at
Fri Sep 9 14:36:06 UTC 2022

On Fri, 9 Sept 2022 at 12:50, Simon Ser <contact at> wrote:

> On Friday, September 9th, 2022 at 12:23, Hans de Goede <
> hdegoede at> wrote:
> > "people using
> > non fully integrated desktop environments like e.g. sway often use custom
> > scripts binded to hotkeys to get functionality like the brightness
> > up/down keyboard hotkeys changing the brightness. This typically involves
> > e.g. the xbacklight utility.
> >
> > Even if the xbacklight utility is ported to use kms with the new
> connector
> > object brightness properties then this still will not work because
> > changing the properties will require drm-master rights and e.g. sway will
> > already hold those."
> I don't think this is a good argument. Sway (which I'm a maintainer of)
> can add a command to change the backlight, and then users can bind their
> keybinding to that command. This is not very different from e.g. a
> keybind to switch on/off a monitor.
> We can also standardize a protocol to change the backlight across all
> non-fully-integrated desktop environments (would be a simple addition
> to output-power-management [1]), so that a single tool can work for
> multiple compositors.

Yeah, I mean, as one of the main people arguing that non-fully-integrated
desktops are not the design we want, I agree with Simon.


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