Bug 471822

Summary:	Monitor can't go in standby on Wayland with monitor's "Auto" mode
Product:	[Plasma] plasmashell	Reporter:	Enrico <enricobe>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	kde, nate
Priority:	NOR
Version First Reported In:	5.27.6
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Enrico 2023-07-01 07:58:23 UTC

Hello,
my monitor has an "auto" mode that automatically switch the input soruce (HDMI or DisplayPort). It works fine on X11 and on Windows, but not on Wayland. When I'm on Wayland the monitor never goes in standby, it's always-on. This happens in Plasma as in GNOME so I I reported it on Wayland's gitlab.

They replied that is something related to the DE and not to Wayland. See: https://gitlab.freedesktop.org/wayland/wayland/-/issues/351

Operating System: Kubuntu 23.04
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.8
Kernel Version: 6.2.0-24-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × 12th Gen Intel® Core™ i5-1240P
Memory: 7.3 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: Intel(R) Client Systems
Product Name: NUC12WSHi5

Comment 1 Nate Graham 2023-09-14 19:06:56 UTC

Indeed, Wayland is a protocol that gets implemented; it doesn't have any code of its own. So if the issue happens in both Plasma and GNOME, there either both of those desktop environments' compositors suffer from exactly the same bug, or else it's a single bug somewhere deeper in the stack, most likely in your graphics drivers. So I'd recommend that you report this at https://docs.mesa3d.org/bugs.html.

Comment 2 Enrico 2023-09-14 19:30:58 UTC

Thanks a lot for your tips. Much more useful than the Wayland's one.

Comment 3 Nate Graham 2023-09-14 19:36:28 UTC

You're welcome!

Comment 4 Enrico 2023-10-11 20:38:44 UTC

Hello,
I'm not sure if this bugfix has been ported on Neon Unstable https://bugs.kde.org/show_bug.cgi?id=452553 but it probably fixed this problem for me.
I've updated to the latest Neon Unstable and the monitor standby now works fine. Many thanks!