Windows 10 1903 (May 2019 update) issues and fixes PLEASE READ

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This topic contains 8 replies, has 5 voices, and was last updated by  Florian Höch (@fhoech) 1 day, 13 hours ago.

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  • #18469

    Florian Höch (@fhoech)
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    1. Calibration loading and profile installation

    Calibration loading may stop working. This affects both the Windows-internal calibration loader as well as any 3rd party calibration loaders (including DisplayCAL profile loader), applications like f.lux, and others that try to use the Windows SetDeviceGammaRamp API. Profile installation (which sets initial calibration upon installation) may also not be possible.

    To resolve these problems, please install KB4501375 (released June 27, 2019, OS 10 build 18362.207), offered via Windows Update (you may have to manually check for updates and then manually select to install the update under “Additional Updates”).

    Relevant KB4501375 fixes:

    • Addresses an issue that may cause Night light, Color Management profiles, or gamma correction to stop working after shutting down a device.

    In case this does not fix the issues completely, turn OFF “Fast Startup” in the “legacy” Windows control panel under “Hardware and Sound” -> “Power Options” -> “Choose what the power buttons do”.

    2. Severe banding even with linear/identity (no) calibration

    If you are observing severe banding (stripes) on gradients even when no calibration is active, disable the task “Calibration Loader” in the Windows 10 Task Scheduler under “Microsoft” -> “Windows” -> “WindowsColorSystem” (DisplayCAL 3.8.3 profile loader will try to do this automatically for you), and log out and back in. The log out and back in procedure may need to be repeated each time a display’s default associated profile is changed.

    • This topic was modified 3 weeks ago by  Florian Höch. Reason: Added steps to disable Windows Calibration Loader
    • This topic was modified 2 weeks, 5 days ago by  Florian Höch. Reason: Added more info for Windows 10 1903 banding issue
    #18563

    Pneumatic (@pneumatic)
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    Just wanted to report that disabling fast startup and the WindowsColorSystem task solves the issue on my system, but only with the latest Nvidia driver (430.86).

    With older driver 419.xx I still have some banding near black, which does not occur on Win 10 1809.

    #18671

    asdfage wegagag (@asdfage)
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    Hi Florian,  does this banding issue affect Color managed apps negatively (unpredictably) such as photoshop and Madvr (mpchc) ?

    Do you recommend going back to older versions of windows or even windows 7 for more reliable Color ?

    How do experts such as yourself setup their color environment for reliability and immunity towards anomalies such as these updates ?

    #18682

    Florian Höch (@fhoech)
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    Hi Florian, does this banding issue affect Color managed apps negatively (unpredictably) such as photoshop and Madvr (mpchc) ?

    It affects the whole desktop.

    Do you recommend going back to older versions of windows or even windows 7 for more reliable Color ?

    Microsoft themselves recommend to not update to 1903 until issues are resolved with a future Windows 10 update. I wouldn’t go back to Windows 7 myself, MS will cease support (security updates) on 14 January 2020 (except for enterprise customers with a volume license, but they intend to charge for this extended support).

    How do experts such as yourself setup their color environment for reliability and immunity towards anomalies such as these updates ?

    I deal with them as they occur. I am also not usually updating right as a big update becomes available, but hold off until I get a clearer picture (reading forums, news articles) what the update might affect. I am currently using 1903 with the latest updates. As I do not often change profiles, the log out and back in requirement doesn’t bother me much.

    #18721

    Emil (@emil)
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    Hi, I have the color banding issue on my system as well. Can you load an ICC profile without banding after applying the Task Scheduler fix?

    #18744

    Hi,

    Does this issue affect calibration measurements? Bcs, my display calibration was done without the fix applied.

    #18755

    Florian Höch (@fhoech)
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    Can you load an ICC profile without banding after applying the Task Scheduler fix?

    See above. Log out and back in is required after a profile change.

    Does this issue affect calibration measurements?

    Banding issue – yes, because it reduces the effective bit depth.

    #18782

    Emil (@emil)
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    Thank you.  It works for standard srgb profile but when I load another icc profile, I get banding again. It’s not the same vertical banding like the bug from Windows but I get a couple of hard lines towards the darks. Do you know what would be the cause? Do all icc profiles cause banding or is it possible for them to still display smooth gradients?

    Thanks

    #18799

    Florian Höch (@fhoech)
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    Thank you. It works for standard srgb profile but when I load another icc profile, I get banding again. It’s not the same vertical banding like the bug from Windows

    This sounds exactly like 2. above though.

    Do all icc profiles cause banding or is it possible for them to still display smooth gradients?

    It depends on the application that is used. On a purely 8-bit display path, some banding with nonlinear calibration is unavoidable if the graphics card doesn’t apply dithering. But apart from calibration-induced banding (which can be normal to some extent), there’s also the color management of applications that can introduce (additional) banding if it doesn’t do processing in high enough bit depth and doesn’t employ dithering.

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