Bug 437403

Summary: System brightness changing when power cable or HDMI are connected or disconnected
Product: [Plasma] plasmashell Reporter: Lucas <lucas.olvr.campos>
Component: Power management & brightnessAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: kdedev
Priority: NOR    
Version First Reported In: 5.21.5   
Target Milestone: 1.0   
Platform: Kubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Lucas 2021-05-20 12:23:59 UTC 
SUMMARY
Once per session, inserting or removing notebook power cable (if machine was turned on on battery or  if it was turned on with power cable on, respectively), or inserting then removing HDMI, reduces screen brightness automatically. After it happens once, it won't happen again until system reboot.

STEPS TO REPRODUCE
1. Turn on notebook on battery
2. Insert power cable

or

1. Turn on notebook on ac power
2. Remove power cable

or

1. Insert HDMI
2. Remove HDMI

OBSERVED RESULT

Screen brightness reduced to 1%

EXPECTED RESULT

No change

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04 - kernel 5.11.0-17
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Comment 1 TraceyC 2025-03-06 20:35:48 UTC 
I'm sorry we weren't able to respond to this report before now. Is this still a problem on Plasma 6.3.2 or later?
Comment 2 Bug Janitor Service 2025-03-21 03:46:49 UTC 
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 3 Bug Janitor Service 2025-04-05 03:46:46 UTC 
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.