Display pastellifying of colors

Every once in a while my display's colors became muted, pastel, and less vibrant, but only on one monitor.

As a reminder, can you please post the output of:

sudo lshw -C video

The make and model of the graphics card(s) you are using and your current Kernel version?

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description: VGA compatible controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
logical name: /dev/fb0
version: 07
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom fb
configuration: depth=32 driver=i915 latency=0 mode=1366x768 visual=truecolor xres=1366 yres=768
resources: iomemory:600-5ff iomemory:400-3ff irq:135 memory:6000000000-6000ffffff memory:4000000000-400fffffff ioport:4000(size=64) memory:c0000-dffff

Driver looks ok...
Can you run

xrandr --listmonitors

Then, using the information for the second monitor found from the command above to replace EXAMPLE below:

xrandr --output EXAMPLE --set "Broadcast RGB" "Full"

Monitors: 2
0: +*HDMI-1 1920/521x1080/293+1366+0 HDMI-1
1: +eDP-1 1366/344x768/193+0+502 eDP-1


eDP would be the Built-In notebook monitor, withe HDMI being the secondary external monitor.

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