diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index a0fe623..84f8a6f 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -94,10 +94,18 @@
 	}
 	/* enable msi */
 	rdev->msi_enabled = 0;
-	if (rdev->family >= CHIP_RV380) {
+	/* MSIs don't seem to work on my rs780;
+	 * not sure about rs880 or other rs780s.
+	 * Needs more investigation.
+	 */
+	if ((rdev->family >= CHIP_RV380) &&
+	    (rdev->family != CHIP_RS780) &&
+	    (rdev->family != CHIP_RS880)) {
 		int ret = pci_enable_msi(rdev->pdev);
-		if (!ret)
+		if (!ret) {
 			rdev->msi_enabled = 1;
+			DRM_INFO("radeon: using MSI.\n");
+		}
 	}
 	drm_irq_install(rdev->ddev);
 	rdev->irq.installed = true;