The DRM platform should be able to adjust gamma and to support things like redshift.
**The current plan for KWin is:**
* Abstract away X and Wayland differences in platform plugins
** X: use existing gamma changer in KWin's X plugin (via effect?)
** Wayland: Call `drmModeCrtcSetGamma` from libdrm in the drm plugin
* DBus interface to allow apps/applets to set the gamma or color temperature value (alternative: write own KWin KCMs)
See also: https://bugs.kde.org/show_bug.cgi?id=371494