I have KDE set to Turn Off Screen after 5 minutes and to Sleep after 10 minutes of inactivity. This works when I first turn on the machine, but eventually stops working after a few hours of general use (mostly Firefox, VS Code, and some Steam games). Sometimes the screen isn’t turning off at all, other times the screen turns off but the machine never goes to sleep. (Explicitly telling it to go to sleep from the main menu always works.)
EDIT: Seems like browser tabs or Steam are the likely culprits. I would often leave Steam running in the background, and KDE is suspending more reliably for me now after I close it. Possibly this steam-for-linux GitHub issue.
I figure there’s either some sort of issue with KDE power management, or one (or more) applications are preventing it from sleeping. How do I troubleshoot this further?
systemd-inhibit just lists PowerDevil, which seems to be KDE’s power management service:
$ systemd-inhibit --list --mode=block
WHO UID USER PID COMM WHAT WHY MODE
PowerDevil 1000 iggames 4115 org_kde_powerde handle-power-key:handle-suspend-key:handle-hibernate-key:handle-lid-switch KDE handles power events block
1 inhibitors listed.
One time, I clicked KDE’s Power Management notification icon, and it showed me an app that was preventing sleep (a game that had not exited properly). Most of the time, however, it doesn’t list anything.
Is there a way to see what apps are causing “activity” that would prevent PowerDevil from suspending the machine? What should I try next?
System details:
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1
Kernel Version: 6.8.11-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × 12th Gen Intel® Core™ i5-12400
Memory: 31.1 GiB of RAM
Graphics Processor: AMD Radeon RX 6600
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B660M DS3H DDR4
Same here. Like… forever now.
When I click “hibernate”/ “standby”, the PC goes off for a second, and then switches on again. Resetting the energy settings to default helped for some time, but that only made it a bit less often IIRC, not fixing it.
On my laptop, that doesn’t happen. I set it to go to standby if the lid closes, and it works as it should.
My thesis is, that there are different standby-states. KDE tries to force one explicit kind of it, and if the device doesn’t support it, it won’t go into standby properly.
On Gnome on the other hand, I never had problems with the standby on my PC. It’s a KDE issue
Unfortunately I have the same symptoms you do… On GNOME.
It doesn’t always happen, but every now and then the system will get into a state that suspend doesn’t work.