Bug 492481 - Brightness setting does not apply on one of my monitors and gets stuck at 27% after wake
Summary: Brightness setting does not apply on one of my monitors and gets stuck at 27%...
Status: REPORTED
Alias: None
Product: plasmashell
Classification: Plasma
Component: Power management & brightness (show other bugs)
Version: 6.2.4
Platform: Other Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords: multiscreen
Depends on:
Blocks:
 
Reported: 2024-09-01 07:40 UTC by hammadilyas720+kdeBugs
Modified: 2025-03-06 18:38 UTC (History)
4 users (show)

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Version Fixed In:
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Description hammadilyas720+kdeBugs 2024-09-01 07:40:55 UTC 
SUMMARY


STEPS TO REPRODUCE
1. Change brightness from Panel

OBSERVED RESULT
It only changed brightness of one of my two monitors


EXPECTED RESULT
It should change brightness of both monitors


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Nobara Linux 40
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
Kernel Version: 6.10.6-200.fsync.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7700 8-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2
Manufacturer: ASUS
Comment 1 hammadilyas720+kdeBugs 2024-09-01 11:06:08 UTC 
Update on STEPS TO REPRODUCE

1. Wait for screen to turn off
2. After screen is off, wait 10 seconds
3. Turn on the screen by clicking any button on the keyboard
4. Change brightness from Panel
Comment 2 Nate Graham 2024-09-04 03:56:48 UTC 
Does it always fail, or sometimes fail?

If it's sometimes, this is very likely Bug 482713.

If it always fails, then we need some more information:
- How is the monitor connected?
- Has changing screen brightness via Plasma ever worked?
- Can you paste the output of `kscreen-doctor -o`?
Comment 3 hammadilyas720+kdeBugs 2024-09-04 16:56:09 UTC 
This happens always for me. After system go to sleep and wakes up, one of of the monitor is always dimmer and I am unable to change the brightness of that monitor.

- How is the monitor connected?
    The faulty one is connected with DP and the other one is connected with HDMI.

- Has changing screen brightness via Plasma ever worked?
    It works fine when I start my computer. After computer wakes up from sleep, it stops working for one of my monitors.

- Can you paste the output of `kscreen-doctor -o`?

Output: 1 HDMI-A-2
        enabled
        connected
        priority 2
        HDMI
        Modes:  0:1920x1080@60*!  1:1920x1080@60  2:1920x1080@50  3:1680x1050@60  4:1600x900@60  5:1280x1024@60  6:1440x900@60  7:1280x800@60  8:1280x720@60  9:1280x720@60  10:1280x720@50  11:1024x768@60  12:800x600@60  13:720x576@50  14:720x480@60  15:640x480@60  16:640x480@60 
        Geometry: 1920,0 1920x1080
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: unknown
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none
        Color profile source: sRGB
Output: 2 DP-4
        enabled
        connected
        priority 1
        DisplayPort
        Modes:  0:1920x1080@60*!  1:1920x1080@144  2:1920x1080@120  3:1920x1080@120  4:1920x1080@100  5:1920x1080@60  6:1920x1080@50  7:1920x1080@30  8:1920x1080@25  9:1920x1080@24  10:1600x1200@60  11:1680x1050@60  12:1400x1050@60  13:1600x900@60  14:1280x1024@75  15:1280x1024@60  16:1440x900@60  17:1280x960@60  18:1280x720@60  19:1280x720@60  20:1280x720@50  21:1024x768@75  22:1024x768@70  23:1024x768@60  24:800x600@75  25:800x600@72  26:800x600@60  27:800x600@56  28:720x576@50  29:720x480@60  30:640x480@75  31:640x480@73  32:640x480@60  33:640x480@60 
        Geometry: 0,0 1920x1080
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: Automatic
        RgbRange: unknown
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none
        Color profile source: sRGB
Comment 4 Nate Graham 2024-09-05 13:30:56 UTC 
Thanks. When this happens, what level of brightness does the screen get stuck on? By any chance is it 21%?
Comment 5 hammadilyas720+kdeBugs 2024-09-05 19:15:35 UTC 
It gets stuck at 27%.