[Bug 99114] [SKL] External VGA monitor not detected after DPMS/second hotplug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99114

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 features|                            |display/DP
      i915 platform|                            |SKL

--- Comment #5 from Imre Deak <imre.deak at intel.com> ---
Looks like the DP->VGA adaptor NAKs the DPCD SINK_COUNT read during detection
while it's in low power state. At the same time it correctly returns the DPCD
receiver cap registers. Could you try the following:

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index db75bb9..e8673ba 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4099,6 +4099,8 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
        uint8_t *dpcd = intel_dp->dpcd;
        uint8_t type;

+       intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
+
        if (!intel_dp_get_dpcd(intel_dp))
                return connector_status_disconnected;

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