Auto dimming screen in KDE plasma

Ask Fedora
,
1

Hi,
I am using fedora with kde in my laptop which has an external monitor (LG TV). In my external monitor, it dims when i watch darker content and it get bright when i watch lighter content. This only happens in this external monitor and not happen in gnome. I did:

1- disabled Dim Automatically in Power Management

2- change settings to “[Service] Environment=POWERDEVIL_NO_DDCUTIL=1" in “systemctl --user edit plasma-powerdevil.service”

But still same. Please help.

My specs:
DE: KDE Plasma 6.4.5
Host: Victus by HP Gaming Laptop 15
Kernel: Linux 6.17.4-200.fc42.x86_64
CPU: 13th Gen Intel(R) Core™ i5-13420H (12) @ 4.60 GHz
GPU 1: NVIDIA GeForce RTX 4050 Max-Q / Mobile [Discrete]
GPU 2: Intel UHD Graphics @ 1.40 GHz [Integrated]

2

Sounds like what HDR does?
try disabling HDR for that monitor?

3

Hi Thanks for replying.
Both screens are not HDR support.

Below is an output of kscreen-doctor -o

Output: 1 eDP-1 b8bbb288-c1be-49c6-a449-d60b48b046c5
        enabled
        connected
        priority 2
        Panel
        replication source:0
        Modes:  1:1920x1080@144!  2:1920x1080@60*  3:1280x1024@60  4:1280x1024@144  5:1024x768@60  6:1024x768@144  7:1280x800@60  8:1280x800@144  9:1600x900@60  10:1600x900@144  11:1368x768@60  12:1368x768@144  13:1280x720@60  14:1280x720@144 
        Geometry: 0,0 1920x1080
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: Automatic
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 0% and dimming to 100%
        Color resolution: automatic (10), range: [6; 12] bits per color
        Allow EDR: never
Output: 2 HDMI-A-1 805fbcbf-2460-4068-8f3c-82f59ba880df
        enabled
        connected
        priority 1
        HDMI
        replication source:0
        Modes:  15:1920x1080@60*!  16:1920x1080@60  17:1920x1080@60  18:1920x1080@50  19:1920x1080@50  20:1920x1080@30  21:1920x1080@24  22:1680x1050@60  23:1400x1050@60  24:1600x900@60  25:1280x1024@75  26:1280x1024@60  27:1440x900@60  28:1280x800@60  29:1152x864@75  30:1280x720@60  31:1280x720@60  32:1280x720@60  33:1280x720@50  34:1024x768@75  35:1024x768@70  36:1024x768@60  37:800x600@75  38:800x600@60  39:720x576@50  40:720x480@60  41:640x480@75  42:640x480@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
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 35% and dimming to 100%
        Color resolution: unknown
        Allow EDR: unsupported
6

Okay, guys. I found that this dimming issue occurs in gnome also but in a low amount compared to kde. :face_exhaling: