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@@ -24,6 +24,73 @@ Building from source See the file [HACKING](HACKING.md) for more details on building from source. +FAQ +--- + +**Where can I find my coordinates to put in the configuration file?** + +There are multiple web sites that provide coordinates for map locations, for +example clicking anywhere on Google Maps will bring up a box with the +coordinates. Remember that longitudes in the western hemisphere (e.g. the +Americas) must be provided to Redshift as negative numbers. + +**Why doesn't Redshift work on my Chromebook/Raspberry Pi?** + +Certain video drivers do not support adjustable gamma ramps. In some cases +Redshift will fail with an error message, but other drivers silently ignore +adjustments to the gamma ramp. + +**Why doesn't Redshift change the backlight when I use the brightness option?** + +Redshift has a brightness adjustment setting but it does not work the way most +people might expect. In fact it is a fake brightness adjustment obtained by +manipulating the gamma ramps which means that it does not reduce the backlight +of the screen. Preferable only use it if your normal backlight adjustment is +too coarse-grained. + +**Why doesn't Redshift work on Wayland (e.g. Fedora 25)?** + +The Wayland protocol does not support Redshift. There is currently no way for +Redshift adjust the color temperature in Wayland. + +**Why doesn't Redshift work on Ubuntu with Mir enabled?** + +Mir does not support Redshift. + +**The redness effect is applied during the day instead of at night. Why?** + +This usually happens to users in America when the longitude has been set in the +configuration file to a positive number. Longitudes in the western hemisphere +should be provided as negative numbers (e.g. New York City is at approximately +latitude/longitude 41, -74). + +**Why does the redness effect occasionally switch off for a few seconds?** + +Redshift uses the gamma ramps of the graphics driver to apply the redness +effect but Redshift cannot block other applications from also changing the +gamma ramps. Some applications (particularly games and video players) will +reset the gamma ramps. After a few seconds Redshift will kick in again. There +is no way for Redshift to prevent this from happening. + +**Why does the redness effect continuously flicker?** + +You may have multiple instances of Redshift running simultaneously. Make sure +that only one instance is running for the display where you are seeing the +flicker. + +**Why doesn't Redshift change the color of the mouse cursor?** + +Mouse cursors are usually handled separately by the graphics hardware and is +not affected by gamma ramps. Some graphics drivers can be configured to use +software cursors instead. + +**I have an issue with Redshift but it was not mentioned in this FAQ. What +do I do?** + +Please go to [the issue tracker](https://github.com/jonls/redshift/issues) and +check if your issue has already been reported. If not, please open a new issue +describing you problem. + Donations --------- |