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-rw-r--r--backend/drm/atomic.c10
1 files changed, 6 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);
}