Bug 507246

Summary:	Allow configuring the screen to automatically turn off while locked, even when it's configured to never turn off normally
Product:	[Plasma] plasmashell	Reporter:	Laura David Hurka <laura.stern>
Component:	Power management & brightness	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	CONFIRMED ---
Severity:	wishlist	CC:	kdedev, laura.stern, nate
Priority:	NOR
Version First Reported In:	6.3.3
Target Milestone:	1.0
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Timeout selector for turning off the screen is disabled

Description Laura David Hurka 2025-07-19 21:33:26 UTC

Created attachment 183350 [details]
Timeout selector for turning off the screen is disabled

SUMMARY
This might also be two more or less separate issues:
1. In System Settings, the timeout selector for turning off a locked screen is disabled, when an unlocked screen shall not be turned off.
2. When the screen is locked manually, the timeout for an unlocked screen is used to turn off the screen.

This creates one problem:
The screen can not be locked AND be turned off manually.
Either you have to set a short timeout for the unlocked screen, then the screen will be turned off after this timeout, but is not locked, which seems dangerous.
Or you have to set a very long timeout for the unlocked screen, which is longer than any time the screen could be used in a session, but then the screen does not turn off when it is locked.

STEPS TO REPRODUCE
1. Open System Settings
2. Enter System → Power Management → On AC Power, On Battery, On Low Battery
3. In each mode, set screen turn off timeout to “never” and “when locked: 1 minute”
4. Lock the screen

OBSERVED RESULT
1. The button for “when locked: 1 minute“ is disabled, which makes it difficult to do this configuration.
2. The screen is not turned off 1 minute after locking it.

EXPECTED RESULT
1. The button for “when locked: 1 minute” is usable.
2. The configured timeout is actually used.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 6.3
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Kernel Version: 6.11.0-26-generic (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-6300U CPU @ 2.40GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Intel® HD Graphics 520
Manufacturer: LENOVO
Product Name: 20F6A089CD
System Version: ThinkPad X260

ADDITIONAL INFORMATION
Bug 486986 reads like the timeout selection boxes for locked and unlocked screen are swapped.
That doesn’t work either, because it is not possible to select “when locked: never”.
I have also confirmed that the timeout for unlocked screen is indeed applied for an unlocked screen.

Comment 1 TraceyC 2025-07-24 20:59:16 UTC

(In reply to Laura David Hurka from comment #0)
> SUMMARY
> This might also be two more or less separate issues:
> 1. In System Settings, the timeout selector for turning off a locked screen
> is disabled, when an unlocked screen shall not be turned off.
> 2. When the screen is locked manually, the timeout for an unlocked screen is
> used to turn off the screen.

Let's keep these in the same report for now. On git-master, #1 is still a problem in the UI but I can't reproduce #2
I can reproduce both on Plasma 6.4.3, so it looks like #2 is fixed and will be shipped in 6.4.4

On AC Power profile, using the settings in the screenshot (using a 20s timeout instead of 1m)
I can easily replicate #1

I cannot replicate:
2. When the screen is locked manually, the timeout for an unlocked screen is used to turn off the screen.
- With turn off screen set to 1min and "when locked" to 20s:
  Locked system, screen turned off at 20sec - OK

- With turn off screen set to Never and "when locked" to 20s:
  Locked system, screen turned off at 20sec - OK