--- drivers/gpu/drm/radeon/radeon_legacy_encoders.c

+++ drivers/gpu/drm/radeon/radeon_legacy_encoders.c

@@ -89,6 +89,7 @@ static void radeon_legacy_lvds_dpms(stru

udelay(panel_pwr_delay * 1000);

WREG32(RADEON_LVDS_GEN_CNTL, lvds_gen_cntl);

WREG32_PLL(RADEON_PIXCLKS_CNTL, pixclks_cntl);

+ udelay(panel_pwr_delay * 1000);

break;

}