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-rw-r--r--backend/drm/atomic.c10
-rw-r--r--docs/env_vars.md2
2 files changed, 8 insertions, 4 deletions
diff --git a/backend/drm/atomic.c b/backend/drm/atomic.c
index ad80f2fd..fc649d68 100644
--- a/backend/drm/atomic.c
+++ b/backend/drm/atomic.c
@@ -208,10 +208,12 @@ static bool atomic_crtc_set_gamma(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc, size_t size,
uint16_t *r, uint16_t *g, uint16_t *b) {
// Fallback to legacy gamma interface when gamma properties are not available
- // (can happen on older intel gpu's that support gamma but not degamma)
- // TEMP: This is broken on AMDGPU. Always fallback to legacy until they get
- // it fixed. Ref https://bugs.freedesktop.org/show_bug.cgi?id=107459
- if (crtc->props.gamma_lut == 0 || true) {
+ // (can happen on older Intel GPUs that support gamma but not degamma).
+ // TEMP: This is broken on AMDGPU. Provide a fallback to legacy until they
+ // get it fixed. Ref https://bugs.freedesktop.org/show_bug.cgi?id=107459
+ const char *no_atomic_str = getenv("WLR_DRM_NO_ATOMIC_GAMMA");
+ bool no_atomic = no_atomic_str != NULL && strcmp(no_atomic_str, "1") == 0;
+ if (crtc->props.gamma_lut == 0 || no_atomic) {
return legacy_iface.crtc_set_gamma(drm, crtc, size, r, g, b);
}
diff --git a/docs/env_vars.md b/docs/env_vars.md
index 1b1a5fd6..b67d1652 100644
--- a/docs/env_vars.md
+++ b/docs/env_vars.md
@@ -7,6 +7,8 @@ wlroots specific
considered the primary DRM device.
* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
mode setting
+* *WLR_DRM_NO_ATOMIC_GAMMA*: set to 1 to use legacy DRM interface for gamma
+ control instead of the atomic interface
* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
wayland, x11, headless)