Bug 486412

Summary:	Powerdevil does not detect external display's i2c interface
Product:	[Plasma] Powerdevil	Reporter:	kndevl
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	fanzhuyifan, me, natalie_clarius
Priority:	NOR
Version:	6.0.4
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description kndevl 2024-05-01 17:20:48 UTC

I use a laptop connected to an external display.

`ddcutil detect` lists the external display at /dev/i2c-13. The user is added to the i2c group.

The brightness control on the panel does not show this display. It only shows the laptop display's brightness slider.

Expected: The brightness control either displays both brightness sliders (one for external and one for internal display), or shows a single slider to control both sets of brightnesses.

Actual: Only one brightness slider visible. Changing the slider does not affect external display's brightness.

This could be related to https://bugs.kde.org/show_bug.cgi?id=465256 but the difference is that I don't have any DDC/powerdevil errors in my journal.

Comment 1 Natalie Clarius 2024-05-01 21:10:43 UTC

*** This bug has been marked as a duplicate of bug 431994 ***