Bug 481670

Summary:	screen energy saving not working (with HDMI cable)
Product:	[KDE Neon] neon	Reporter:	Duns <web>
Component:	general	Assignee:	Neon Bugs <neon-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	jr, julien.dlq, mds_foss, neon-bugs-null, sitter, web
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Duns 2024-02-22 12:46:54 UTC

SUMMARY
***
After the set time, the screen remain still on (with screensaver working or not)
***


STEPS TO REPRODUCE
1. Set Screen Energy Saving -> switch off after 4 min.
2. Expect 5 min.
3. The screen is always on

OBSERVED RESULT

The screen is always on

EXPECTED RESULT

The screen should off after 4 min

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.114.0
Qt Version: 5.15.12
Kernel Version: 6.5.0-18-generic (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5700G with Radeon Graphics
Memory: 13,5 GiB of RAM
Graphics Processor: AMD Radeon Graphics

ADDITIONAL INFORMATION

Comment 1 Duns 2024-02-23 05:56:40 UTC

I noticed that

1) The screen goes off at the expected time, but after a few seconds it is back with an unending screensaver loop
2) This morning I tried using not an hdmi cable, but with a vga one, and all seems correct.

So, the problem seems be HDMI cable.

Comment 2 Duns 2024-02-23 06:07:06 UTC

Indeed I found searching with Google many cases of HDMI bad behavior of screen energy saving (in my case even with x11, not trying wayland).
I think that it is a bug that developers should solve. 
Or there is already some fix?

Comment 3 mydarkstar 2024-04-06 10:05:02 UTC

Would this bug be filed more correctly for Powerdevil (5.27) perhaps?
That's what handles dimming and turning off displays after a pre-defined idle time.

Or is it specific to KDE neon, the distribution?

Also, would you please be so kind and check if this is also an issue if you boot the latest KDE neon version?