Red Screen Artifacts When flux is on

apreslin

@herf Thanks for the response. I made a 2 minute YouTube video https://www.youtube.com/watch?v=xq0usnYwz80 (listen with sound on of me describing the issue) which shows the problem. I don't have Iris Plus or any discrete GPU enabled, only a PCIE NVIDIA GeForce RTX 2060 with the latest drivers version 26.21.14.4187 dated 12/24/2019. That GPU has quad monitors connected to it, 3 of them on DisplayPort and one on HDMI. This also happened on a different video card in the same system, a NVIDIA GeForce GTX 1660, so it doesn't seem to be something like a defective video card. I also tried swapping out cables, and that didn't make a difference.

Any thoughts on what might be the issue with f.lux in that setup that's causing the cyan colored artifacts in video?

NVIDIA 26.21.14.4187: NVIDIA GeForce RTX 2060 (20191224)

Generic PnP Monitor, 598 x 336mm, built 2016
Chromaticities:
R=0.645508 0.336914
G=0.328125 0.615234
B=0.146484 0.055664
W=0.313477 0.329102
sRGB gamut: 85%, AdobeRGB gamut: 60%

Monitor 1 on NVIDIA GeForce RTX 2060: VCGT=0 gamma=1
Monitor 2 on NVIDIA GeForce RTX 2060: VCGT=0 gamma=1
Monitor 3 on NVIDIA GeForce RTX 2060: VCGT=0 gamma=1
Monitor 4 on NVIDIA GeForce RTX 2060: VCGT=0 gamma=1

Windows Build: 19033.1

herf

@apreslin so this is the insider build? Nice setup :)

I saw artifacts on the top two monitors but not on the bottom two - are you seeing on all?

Also, do they go away if you unplug HDMI and only use DisplayPort?

apreslin

@herf It is an insider build, but I'm pretty sure this issue was happening before I changed over to an insider build. Yeah, go big with quad 27" monitors or go home :)

The artifacts only occur on 2 of the 4 monitors for some reason.

I just tested with different combinations. With only 3 monitors connected, I can't reproduce the artifacts at all.

Tried all 3 on DisplayPort with no artifacts.
Tried 2 on DisplayPort, 1 on HDMI, no artifacts.
Connected all 4 back up, artifacts appear when f.lux is started.

So the only way I seem to have the issue is when it's connected to all 4 at once. The other interesting thing about the issue is that is always affects 2 of the 4 monitors, but not always the same 2. Also, it's not always the HDMI connected monitor being one of the two monitors that have the artifacts.

Armenian Bot

I've been having the exact same issue since I got my laptop late last year. My presumption was that it had something to do with the HDR nature of my display? But that could definitely be wrong from what I am reading here. Let me know if that lines up with anyone else.

markotny97

Same here, MSI GS65 with GTX 1660Ti. Blue artifacts only on external display. For me it seems to happen only if I have one external monitor, if I connect second (different model) I can't reproduce the issue. Happens on both monitors (if only one connected). Neither has HDR so that's not the issue, at least not in this case.

fernandezcojones

Same problem here - two displays connected to GTX 1080Ti, weird artifacts (like in this post: https://forum.justgetflux.com/post/22665) on one screen. If a third screen is connected, the artifacts show on one screen only, but not the same as with two displays connected. No HDR displays.

All of this is instantly remedied by toggling Night Light on and off and then it doesn't appear until a restart.

apreslin

@herf Would you be able to take another look at this thread now that more people are reporting that they are experiencing this bug? Also tweeted at https://twitter.com/apreslin/status/1220409689835474944 at @JustGetFlux

herf

@apreslin Most of these issues (in Insider builds) should be reported to Microsoft also. Usually they are some combination of driver bugs and bugs internal to Windows. It does help if you post "driver info" here so we have a record of when things broke.

Mostly we just forward them on, because they are bugs in the color system. Can you report them through "Feedback hub" from Windows?

fernandezcojones

Reported the bug to MS through Feedback Hub as advised. Available here: https://aka.ms/AA88icf

jcrens8392

Hey I just encountered this issue after calibrating my monitor w a custom profile using i1profiler from X-rite. I'm getting bright red lines showing at any K setting below 5000K. 5000K and above, and there are no red lines. Also, if I switch back to any other ICC profile, I don't get the red lines. This just started happening today after applying this new custom icc profile. Here's a link to the icc profile in case it helps: https://www.dropbox.com/s/zbj9b3zj4bvh88o/LG HDR WQHD_04-05-2020.icc?dl=0

simonr

Red artifacts for me, with the latest Intel driver from April (Surface Laptop 3).
Tried toggling both "use display data for better color" and "use GPU" options, with no effect.

Intel Corporation 27.20.100.8187: Intel(R) Iris(R) Plus Graphics (20200417)

Surface Panel Filter, 285 x 190mm, built 2019
Chromaticities: 
  R=0.639648 0.329102
  G=0.299805 0.599609
  B=0.149414 0.059570
  W=0.312500 0.328125
  sRGB gamut: 99%, AdobeRGB gamut: 64%

Monitor 1 on Intel(R) Iris(R) Plus Graphics: VCGT=0 gamma=1

Windows Build: 18363.778

Interestingly, this problem does not exist on my Surface Book 2:

Intel Corporation 25.20.100.6472: Intel(R) UHD Graphics 620 (20181225)
NVIDIA 26.21.14.3086: NVIDIA GeForce GTX 1050 (20190522)

Surface Display, 750 x 500mm, built 2016
Chromaticities: 
  R=0.639648 0.330078
  G=0.299805 0.599609
  B=0.150391 0.059570
  W=0.312500 0.329102
  sRGB gamut: 100%, AdobeRGB gamut: 64%

Monitor 1 on Intel(R) UHD Graphics 620: VCGT=0 gamma=1

Windows Build: 18363.778

simonr

For me, the artifacts only appear at temps 3250K and below. At 3300K and above, everything is fine.

lamchcl

I'm getting the blue artifacts as well on two different computers with dual-monitor setups. Unsure if it matters, but the artifacts only occur on the monitor on the right side. On one computer, it occurs on the primary monitor, and on another computer, it appears on the secondary monitor. It seems to occur on normal mode (without any effects) if and only if the red value of the pixel is 129, and it looks like the red value becomes 0, or maybe 1 or some other small value (it's hard to measure because obviously the computer thinks it's 129).

Interestingly enough, the artifacts do disappear after a while (maybe after sleeping and waking? will need to do some more experimentation) but they consistently come back after a restart.

Hope this information helps to get this bug fixed ASAP, it's been an annoyance for a while and I didn't realize that f.lux was causing it until now.

apreslin

@lamchcl said in Red Screen Artifacts When flux is on:

I'm getting the blue artifacts as well on two different computers with dual-monitor setups. Unsure if it matters, but the artifacts only occur on the monitor on the right side. On one computer, it occurs on the primary monitor, and on another computer, it appears on the secondary monitor. It seems to occur on normal mode (without any effects) if and only if the red value of the pixel is 129, and it looks like the red value becomes 0, or maybe 1 or some other small value (it's hard to measure because obviously the computer thinks it's 129).

Interestingly enough, the artifacts do disappear after a while (maybe after sleeping and waking? will need to do some more experimentation) but they consistently come back after a restart.

Hope this information helps to get this bug fixed ASAP, it's been an annoyance for a while and I didn't realize that f.lux was causing it until now.

If your blue artifacts are the same as mine, they go away when the monitored is off after going to sleep. They stay away until the computer is rebooted.

You can manually use the monitor Off Utility https://download.cnet.com/Monitor-Off-Utility/3000-20432_4-10967806.html to have the monitors sleep and then move the mouse to bring the monitors back up. Another user above @fernandezcojones found that if you toggle Windows night light on and off they go away. That works for me too.

The developer @herf has said he believes the issue lies within using Insider Builds of Windows. I'm on a Windows Insider build.

@lamchcl Does you or anyone have these artifacts that is not on Windows Insider builds?

@lamchcl I agree about the frustration of the issue and finding it was tricky. I was actually buying and swapping out video cards trying to figure out what was causing it. Now it's just annoying, but at least there's workarounds. Hopefully someday either Microsoft and/or f.lux comes up with a fix. I'm tempted to do a clean install of Windows to see if it was actually tied to Insider builds, but that's a lot of work because I have a pretty complicated Windows setup and a lot of applications doing various things.

neeek

I'm also getting red artifacts only at temperatures 3250K and below on my Lenovo Yoga c940 (haven't tested external displays). When below 3250K, sometimes the artifacts appear/disappear.

When the artifacts are gone, sometimes when switching between applications the artifacts can reappear for a moment and then quickly disappear again. This doesn't happen when dragging a foreground window out of the way abruptly to reveal an image behind it. It only happens when I switch applications (e.g. Alt+Tab). Thought this might be a useful clue for the developers.

Intel Corporation 25.20.100.6847: Intel(R) Iris(R) Plus Graphics (20190614)

Lenovo Display 3840x2160, 309 x 174mm, built 2018
Chromaticities: 
  R=0.666992 0.331055
  G=0.269531 0.661133
  B=0.141602 0.061523
  W=0.312500 0.328125
  sRGB gamut: 100%, AdobeRGB gamut: 82%

Monitor 1 on Intel(R) Iris(R) Plus Graphics: VCGT=0 gamma=1

Windows Build: 18363.836

lamchcl

@apreslin Sorry for the late reply, I wasn't getting notifications for this thread for some reason.

I am indeed using Insider builds; I'm on the slow ring on one computer and the fast ring on the other. I don't have any other Windows computers with f.lux installed, so I can't test whether it's linked to Insider builds either. But if a lot of people with this problem are using Insider Builds, there's probably a link (since not that many people are Windows Insiders compared to the rest of the population).

I haven't restarted my computer in a while (should probably get around to doing that) but if the artifacts come back I'll test if the Night Light workaround has any effect. Thanks for the suggestion.

lamchcl

Just restarted my computer on the Fast Ring, and the blue artifacts are no longer showing up in v4.115 (thanks to https://forum.justgetflux.com/post/23190). Thanks @herf !

apreslin

Fixed for me too! What a relief! Thanks @herf !

dimanish

Still not fixed for me :(
alt text

NVIDIA 26.21.14.4614: NVIDIA GeForce RTX 2080 Ti (20200515)

Dell S2716DG(DisplayPort), 598 x 336mm, built 2016
Chromaticities:
R=0.639648 0.330078
G=0.299805 0.599609
B=0.150391 0.059570
W=0.312500 0.329102
sRGB gamut: 100%, AdobeRGB gamut: 64%

Dell S2716DG(DisplayPort), 598 x 336mm, built 2015
Chromaticities:
R=0.639648 0.330078
G=0.299805 0.599609
B=0.150391 0.059570
W=0.312500 0.329102
sRGB gamut: 100%, AdobeRGB gamut: 64%

Winlimit=0, 0
Monitor 1 on NVIDIA GeForce RTX 2080 Ti: VCGT=0 gamma=1
Monitor 2 on NVIDIA GeForce RTX 2080 Ti: VCGT=0 gamma=1

Windows Build: 19041.329

Johannes1098

@dimanish
You're right.
I'm on 4.116 and I tried some things in f.lux
When activating Grayscale mode from effects, the blue artifacts appeared again for me - but now on the first monitor, not on the second one.

In combination with grayscale mode, it looks very very strange - because everything is gray - and then: blue spots ;)
But after removing grayscale mode, the also persist on the first screen..

Edit: Switching back from 116 to 115 directly fixed it again.
@dimanish can you try the 4.115? https://justgetflux.com/flux-setup4-115.exe

@herf