I have the same exact problem. I'm running a xps 13 (processor/gpu:
intel i7 10510U). I'm using this connector: https://www.dell.com/en-
ie/work/shop/dell-adapter-usb-c-to-hdmi-dp-with-power-pass-
through/apd/470-aegy/pc-accessories#techspecs_section My monitor is a
BenQ EL2870U, I'm using 4K resolution.
My colours are all wrong whenever I dare to change any configuration or
if I connect the monitor after boot. It seems to work fine if I boot it
already connected.
This is the output of xrandr (while it works fine):
XWAYLAND0 connected 3840x2160+1920+0 (0x24) normal (normal left inverted right
x axis y axis) 620mm x 340mm
Identifier: 0x21
Timestamp: 14712
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 0.0
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
non-desktop: 0
supported: 0, 1
3840x2160 (0x24) 266.750MHz -HSync +VSync *current +preferred
h: width 3840 start 4056 end 4456 total 5072 skew 0 clock 52.59KHz
v: height 2160 start 2163 end 2168 total 2192 clock 23.99Hz
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https://bugs.launchpad.net/bugs/1661987
Title:
Wrong colours on some monitors via USB-C to HDMI
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