![]() Sometimes, restarting the computer or disabling mirroring can also fix the issue, but in case nothing works, please contact us here.Ĭan Gamma Dimmer control the real brightness of the monitor? There are cases where not even the dark overlay works (some mirroring setups, virtual displays etc.). To force using a Dark Overlay instead of Gamma, enable the Use dark overlay instead of Gamma dimming setting and restart the app. ![]() Some types of monitors don't have support for Gamma dimming (DisplayLink, Luna Display, Sidecar etc.). If you want to keep using those apps, the best choice is to switch Gamma Dimmer to Overlay mode. Will try to override each other's changes. If both Gamma Dimmer and one of these apps are used at the same time, the Gamma tables might be set to invalid values as the apps ![]() This should be a completely normal use case, and the call should simply do nothing if the gamma tables are already at their default values.īut for unknown reasons, this API call will sometimes set all RGB Gamma tables to 0 and all colors will show up as black. The bug is usually triggered when the app tries to reset the gamma tables to their default values by calling the CGDisplayRestoreColorSyncSettings() system method. This usually happens when custom color profiles are used, but it was reported on some default monitor profiles as well. Switch to Overlay mode to disable Gamma changes.Use a default color profile in System Preferences -> Displays.There's no complete fix for this as it is a macOS bug, but you can lower the chances of it appearing using the following steps: The 2 most common causes for this issue are Color Profiles and other Gamma-altering apps.īecause of a macOS bug in the Gamma API, your screen can go black and stay that way until you disconnect and reconnect the monitor. Usually this can be fixed easily by reconnecting the monitors or restarting the computer. Don't worry, Gamma Dimmer can't make permanent changes to your displays.
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