Hello,
I'm experiencing a problem that after waking from sleep my software
brightness change stops working. Logging out of session fixes the problem.
I'm kinda newbie in Linux so I cannot provide a lot of valuable information
by myself.
OS: Debian 13 stable
Kernel: 6.12.86+deb13.1-amd64
DE: KDE 6.3.6
Frameworks: 6.13.0
QT: 6.8.2
```bash
# When monitors function correctly
oles@debian ~$ kscreen-doctor -o

Output: 1 eDP-1
disabled
connected
priority 0
Panel
Modes: 1:2560x1600@60! 2:2560x1600@48 3:1920x1200@60
4:1920x1080@60 5:1600x1200@60 6:1680x1050@60 7:1280x1024@60
8:1440x900@60 9:1280x800@60 10:1280x720@60 11:1024x768@60 12:800x600@60
13:640x480@60 14:2560x1440@60* 15:1600x900@60 16:1368x768@60
Geometry: 0,0 1766x994
Scale: 1.45
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 60% and dimming to 100%
Output: 2 HDMI-A-1
enabled
connected
priority 1
HDMI
Modes: 17:3440x1440@50! 18:3440x1440@100* 19:3440x1440@60
20:2560x1440@60 21:2560x1080@60 22:2560x1080@60 23:2560x1080@60
24:1920x1200@50 25:1920x1080@60 26:1920x1080@60 27:1920x1080@60
28:1920x1080@50 29:1600x1200@50 30:1680x1050@60 31:1600x900@60
32:1280x1024@75 33:1280x1024
@60 34:1440x900@60 35:1280x800@60 36:1152x864@75 37:1280x720@60
38:1280x720@60 39:1280x720@60 40:1280x720@50 41:1024x768@75
42:1024x768@70 43:1024x768@60 44:832x624@75 45:800x600@75 46:800x600@72
47:800x600@60 48:800x600@56 49:720x576@50 50:720x480@60 51:720x480@60
52:640x480@75 53
:640x480@73 54:640x480@67 55:640x480@60 56:640x480@60 57:720x400@70
58:1600x1200@60 59:1600x1200@100 60:1280x1024@100 61:1024x768@100
62:1920x1200@60 63:1920x1200@100 64:1280x800@100 65:2560x1440@100
66:1920x1080@100 67:1600x900@100 68:1368x768@60 69:1368x768@100
70:1280x720@100
Geometry: 0,0 2752x1152
Scale: 1.25
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 100% and dimming to 100%
#
#
# And when breaks
#
#
oles@debian ~$ kscreen-doctor -o

Output: 1 eDP-1
disabled
connected
priority 0
Panel
Modes: 1:2560x1600@60! 2:2560x1600@48 3:1920x1200@60
4:1920x1080@60 5:1600x1200@60 6:1680x1050@60 7:1280x1024@60
8:1440x900@60 9:1280x800@60 10:1280x720@60 11:1024x768@60 12:800x600@60
13:640x480@60 14:2560x1440@60* 15:1600x900@60 16:1368x768@60
Geometry: 0,0 1766x994
Scale: 1.45
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: unsupported
Output: 2 HDMI-A-1
enabled
connected
priority 1
HDMI
Modes: 17:3440x1440@50! 18:3440x1440@100* 19:3440x1440@60
20:2560x1440@60 21:2560x1080@60 22:2560x1080@60 23:2560x1080@60
24:1920x1200@50 25:1920x1080@60 26:1920x1080@60 27:1920x1080@60
28:1920x1080@50 29:1600x1200@50 30:1680x1050@60 31:1600x900@60
32:1280x1024@75 33:1280x1024
@60 34:1440x900@60 35:1280x800@60 36:1152x864@75 37:1280x720@60
38:1280x720@60 39:1280x720@60 40:1280x720@50 41:1024x768@75
42:1024x768@70 43:1024x768@60 44:832x624@75 45:800x600@75 46:800x600@72
47:800x600@60 48:800x600@56 49:720x576@50 50:720x480@60 51:720x480@60
52:640x480@75 53
:640x480@73 54:640x480@67 55:640x480@60 56:640x480@60 57:720x400@70
58:1600x1200@60 59:1600x1200@100 60:1280x1024@100 61:1024x768@100
62:1920x1200@60 63:1920x1200@100 64:1280x800@100 65:2560x1440@100
66:1920x1080@100 67:1600x900@100 68:1368x768@60 69:1368x768@100
70:1280x720@100
Geometry: 0,0 2752x1152
Scale: 1.25
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: unsupported
```


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