I connected an external screen to a laptop, and the sides are cut off, including almost the entire panel.

All the UI elements also appear blurry, still usable but very noticeably less sharp than when the same monitor is connected to a PC as the only screen.

The wallpaper on the internal screen becomes too bright and low contrast, it looks "correct" when there is no external monitor connected.

Changing scaling on the built-in screen makes no difference.

Both screens are 1920x1080:
Output: 1 eDP-1 a184a802-b6db-482b-b417-0057d4498805
        enabled
        connected
        priority 2
        Panel
        replication source:0
        Modes:  1:1920x1080@60.02*!  2:1920x1080@39.99  3:1680x1050@60.02  4:1280x1024@60.02  5:1440x900@60.02  6:1280x800@60.02  7:1280x720@60.02  8:1024x768@60.02  9:800x600@60.02  10:640x480@60.02  11:1600x900@59.95  12:1600x900@59.95  13:1368x768@59.88  14:1368x768@59.88 
        Geometry: 1920,164 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 60% and dimming to 100%
        Color resolution: automatic (10), range: [8; 16] bits per color
        Allow EDR: always
        Sharpness control: unsupported
Output: 2 HDMI-A-1 a9c14483-581e-431c-b023-56b5cc857848
        enabled
        connected
        priority 1
        HDMI
        replication source:0
        Modes:  15:1920x1080@60.00*!  16:1920x1080@60.00  17:1920x1080@59.94  18:1920x1080@50.00  19:1600x1200@60.00  20:1680x1050@59.88  21:1280x1024@75.03  22:1280x1024@60.02  23:1440x900@59.90  24:1280x800@60.00  25:1152x864@75.00  26:1280x720@60.00  27:1280x720@59.94  28:1280x720@50.00  29:1024x768@75.03  30:1024x768@60.00  31:800x600@75.00  32:800x600@60.32  33:800x600@56.25  34:720x576@50.00  35:720x576@50.00  36:720x576@50.00  37:720x480@60.00  38:720x480@60.00  39:720x480@59.94  40:720x480@59.94  41:720x480@59.94  42:640x480@75.00  43:640x480@72.81  44:640x480@66.67  45:640x480@60.00  46:640x480@59.94  47:640x480@59.94  48:720x400@70.08  49:1600x900@59.95  50:1368x768@59.88 
        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 70% and dimming to 100%
        DDC/CI: allowed
        Color resolution: automatic (10), range: [8; 16] bits per color
        Allow EDR: unsupported
        Sharpness control: unsupported



SOFTWARE/OS VERSIONS
Operating System: KDE Linux 2025-09-17
KDE Plasma Version: 6.4.80
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.16.7-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-3770 CPU @ 3.40GHz
Memory: 16 GiB of RAM (15,3 GiB usable)
Graphics Processor: Intel® HD Graphics 4000