Bug 470664 - Laptop screen brightness not restored if interrupted while screen-dimming
Summary: Laptop screen brightness not restored if interrupted while screen-dimming
Status: REPORTED
Alias: None
Product: Powerdevil
Classification: Plasma
Component: general (show other bugs)
Version: 5.27.5
Platform: Fedora RPMs Linux
: NOR minor
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-06-05 12:12 UTC by slartibart70
Modified: 2024-04-07 03:56 UTC (History)
6 users (show)

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Description slartibart70 2023-06-05 12:12:41 UTC
related bug: https://bugs.kde.org/show_bug.cgi?id=470106

I have a 2 monitor setup, integrated laptop screen and dp-4k monitor.
Wait until powerdevil is locking the screen, and, after some time, dimming the (laptop-only) monitor.
Then interrupt by keyboard press.
Login again.

Expectation: 
Laptop screen brightness should be restored to the same level as before.
What happens instead:
The laptop brightness is 'a bit' brighter than previously dimmed, but still way too dark.

My current workaround is to explicitly call brightnessctl with 'my' settings to get the display bright enough again (or use Fn-* keys)


Operating System: Fedora Linux 37
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.5-100.fc37.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz
Memory: 31,1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630
Manufacturer: LENOVO
Product Name: 20J6003DGE
System Version: ThinkPad T470p
Comment 1 slartibart70 2023-06-05 12:13:30 UTC
also related: https://bugs.kde.org/show_bug.cgi?id=470107
Comment 2 Nicolas Fella 2023-06-11 21:09:02 UTC
What do you mean with "Then interrupt by keyboard press. Login again."?
Comment 3 Jakob Petsovits 2024-04-03 11:37:32 UTC
(In reply to Nicolas Fella from comment #2)
> What do you mean with "Then interrupt by keyboard press. Login again."?

My reading is that this describes the interaction on the lock screen. Keyboard press will (attempt to) cancel the dimming and show the password field. "Login again" refers to unlocking the session, as opposed to anything SDDM-related.

Note that dimming has seen a number of improvements since 5.27.5, in particular:
* https://invent.kde.org/plasma/powerdevil/-/commit/14647dc6ffd1104c1c0ab393518de8a65cb39d70 (went into 5.27.8)
* https://invent.kde.org/plasma/powerdevil/-/commit/8681355217eb6ff121785572eaf4ef2ca21b464b (went into 6.0.1).
The dimming code is still a little fragile in its interactions with other brightness mechanisms, but it's possible that this particular bug has been fixed by now.

Could you retest with a more recent Plasma (5.27.8 or higher, ideally Plasma 6.0.2 or higher) and report back on whether you're still seeing this issue?
Comment 4 Marcus Johansson 2024-04-03 17:12:27 UTC
I can confirm this still happening on plasma 6.0.3.

Forum post here: https://discuss.kde.org/t/night-colors-brightness-and-screen-saver/12285

Since there is no way of triggering this other than randomly catching my computer "dimming" it's hard to provide much more than "it still happens".

But if you have ideas of what I could provide that could help, please let me know.