Good to hear! Basically it's a one-liner change to add the missing link for
mcp79:
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c
@@ -31,6 +31,7 @@ mcp77_sor = {
.state = g94_sor_state,
.power = nv50_sor_power,
.clock = nv50_sor_clock,
+ .bl = &nv50_sor_bl,
.hdmi = &g84_sor_hdmi,
.dp = &g94_sor_dp,
};
I'll try to submit the fix patch to the upstream.