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The screen is perpetually pink, and it won't turn off. When I turn on night light, the color stays the same. I tried using redshift, and it doesn't work. Here's what I get when I type the command "redshift" into terminal: 

Trying location provider `geoclue2'...
Using provider `geoclue2'.
Unable to start GeoClue client:
GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: Geolocation disabled for UID 1000.
Unable to connect to GeoClue.
Unable to get location from provider.

Distressingly, the pink hue also appears when I boot to windows 10. Did Ubuntu just turn my screen pink because it stayed on in that mode for too long?

I'm on a lenovo laptop AMD-12 9700 Radeon ubuntu 17.10

lspci produces

VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Carrizo
  (rev c9)
GraysunLight
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1 Answers1

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Clicking the GUI (graphical user interface) power-off button solved a similar issue for me.

Clarification: That is, open the drop-down menu (upper right in Ubuntu 18.10 - I updated OS in the meantime) that contains wifi, screen dimming, battery status etc., and click the button that'll turn off your computer.

I guess either the screen dimming or the threat of immediate shutdown caused Ubuntu to re-evaluate its display decisions :-)

For me, the issue was that I had put my computer to sleep with night light on, and opened it again many hours later when night light should be off. The built-in display behaved as expected, but the external display was stuck with night light on. Flipping night light on & off didn't help, and mirroring displays didn't help, but threatening to turn the computer off did :-) This is for a Thinkpad connected to a Dell display through a dock, Ubuntu 17.10.

thorbjornwolf
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