commit 03d6069912babc07a3da20e715dd6a5dc8f0f867
Author: Keith Packard <keithp@keithp.com>
Date:   Fri Jun 5 18:19:56 2009 -0700

    drm/i915: Hook connector to encoder during load detection (fixes tv/vga detect)
    
    With the DRM-driven DPMS code, encoders are considered idle unless a
    connector is hooked to them, so mode setting is skipped. This makes load
    detection fail as none of the hardware is enabled.
    
    Signed-off-by: Keith Packard <keithp@keithp.com>
    Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a87eeff..b32a51f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2136,6 +2136,7 @@ struct drm_crtc *intel_get_load_detect_pipe(struct intel_output *intel_output,
 	}
 
 	encoder->crtc = crtc;
+	intel_output->base.encoder = encoder;
 	intel_output->load_detect_temp = true;
 
 	intel_crtc = to_intel_crtc(crtc);
@@ -2171,6 +2172,7 @@ void intel_release_load_detect_pipe(struct intel_output *intel_output, int dpms_
 
 	if (intel_output->load_detect_temp) {
 		encoder->crtc = NULL;
+		intel_output->base.encoder = NULL;
 		intel_output->load_detect_temp = false;
 		crtc->enabled = drm_helper_crtc_in_use(crtc);
 		drm_helper_disable_unused_functions(dev);