Bug 470107

Summary:	Widget should have brightness slider for each connected monitor that supports adjusting its brightness in software
Product:	[Plasma] plasmashell	Reporter:	slartibart70
Component:	Brightness and Color widget	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	wishlist	CC:	daniel-other+kdebug, dougshaw77, gerrit.huebbers, jessica, jpetso, kde, kde, me, mutcianko.m, natalie_clarius, nate, nilskemail+kde, postix, rocketraman
Priority:	NOR
Version First Reported In:	5.27.2
Target Milestone:	1.0
Platform:	Other
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=418502
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description slartibart70 2023-05-22 06:49:10 UTC

Laptop screen and connected 4K (DP) monitor

Problem:
"Battery and Brightness" in systemtray only shows one brightness slider (which controls the laptop monitor exclusively)
The second dp-connected monitor is not taken into account/does not react on the slider settings

I had the problem, that plasma was darkening the laptop screen to 'nearly unreadable' and the brightness control now was acting only(!) on the dp-connected monitor??
The only way to fix this was disconnecting the 2nd monitor, wait a bit, set brightness for the laptop, reconnect 2nd monitor.

I think, this could easily be addressed by having as much brightness-controls as we have monitors connected?
ddcutil sadly only controls the 2nd screen, i cannot set the brightness on laptop screen (so i rely on plasma for doing that)

Any chance to have this added?
(as seen in the error above, plasma is capable of controlling a 2nd screen - but does not offer this in the settings?)




Operating System: Fedora Linux 37
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.3-100.fc37.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz
Memory: 31,1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630
Manufacturer: LENOVO
System Version: ThinkPad T470p

Comment 1 Natalie Clarius 2023-12-29 20:18:59 UTC

*** Bug 479065 has been marked as a duplicate of this bug. ***

Comment 2 Jakob Petsovits 2024-02-28 19:16:07 UTC

There's a mentored project going on right now as part of Season of KDE: https://invent.kde.org/teams/season-of-kde/2024/-/issues/20

There's also work going on in PowerDevil internally to support that project. The overarching task is https://invent.kde.org/plasma/powerdevil/-/issues/19 and I've got a few patches lined up (some in code review, some not yet) to standardize how we deal with brightness-supporting displays. In the end, what we're likely to see is one brightness control for the laptop display (if present) and one for each monitor separately. With KWin being responsible for dimming monitors whose brightness can't be set in hardware.

Hopefully some or all of that work will be available to users in Plasma 6.1. Either way, we're working on it!

Comment 3 Nate Graham 2024-07-27 13:06:46 UTC


*** This bug has been marked as a duplicate of bug 481927 ***