https://bugs.kde.org/show_bug.cgi?id=494722
Jakob Petsovits <jpe...@petsovits.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |xaver.h...@gmail.com
Status|REPORTED |CONFIRMED
Ever confirmed|0 |1
--- Comment #1 from Jakob Petsovits <jpe...@petsovits.com> ---
The PowerDevil service does not store screen brightness across restarts. It
starts up with whatever the current screen brightness is, and other mechanisms
will usually remember brightness upon shutdown (e.g. systemd for laptop screen
backlight brightness, monitors with their own memory and firmware).
On Wayland, the direction (as of Plasma 6.2) is for KWin to store all
brightness values and call PowerDevil to restore them for any monitors that are
detected. Communication between KWin and PowerDevil happens via Wayland
protocols.
On X11, there are no plans currently to introduce storage of brightness values
across sessions. This is what you're hitting.
There is an ongoing effort - hopefully landing soon via
https://invent.kde.org/plasma/powerdevil/-/merge_requests/466 - to make
PowerDevil's screen brightness controller aware of the difference between
nominal (configured) brightness and dimmed brightness.
Once we have this, we *could* try to detect when the service is shut down,
delay shutdown and set the brightness back to un-dimmed brightness, and quit
only afterwards. That seems like a whole bunch of work, however, and given the
many other tasks that I've somehow ended up with, I'm not sure I can spare the
time to implement this.
You write this:
> On boot, screen at 100% brightness, like it was before Plasma 6.2
That makes me assume you're using a laptop with built-in screen, plus an
external monitor. Because the same issue was present long before Plasma 6.2,
before 6.0 even, for people that used *only* a laptop screen or *only* an
external monitor. The difference with 6.2 is that Plasma now controls more than
one display, so it will *also* dim your external monitor in addition to the
laptop screen (and then also leave that in a dimmed brightness level across
restarts). That's our regression. I've been trying to come up with plans & some
code in this issue: https://invent.kde.org/plasma/powerdevil/-/issues/38
But this particular issue won't be solved by my plans & code so far. One thing
we could do on X11 across reboots, to make at least the regression go away,
would be to avoid dimming external monitors for users with a built-in laptop
display. On KWin, with brightness storage and hopefully soon a Wayland protocol
for dimming, we can continue to dim. Does that sound reasonable?
For the remaining users, on X11 sessions with *only* a laptop screen or *only*
external monitors attached to a desktop PC, this is a WONTFIX from my point of
view unless someone else decides to step up and provide some patches to reset
brightness on exit.
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