[Bug 74628] [eDP regression] blank screen on boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74628

--- Comment #13 from Patrik Jakobsson <patrik.r.jakobsson at gmail.com> ---
Moving the conversation back here (my bad)...

Chris Wilson wrote:

I'd feel more comfortable with;

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 46d065b..876184f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1872,9 +1872,11 @@ static void intel_disable_dp(struct intel_encoder
*encoder)

        /* Make sure the panel is off before trying to change the mode. But
also
         * ensure that we have vdd while we switch off the panel. */
+       edp_panel_vdd_on(intel_dp);
        intel_edp_backlight_off(intel_dp);
        intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
        intel_edp_panel_off(intel_dp);
+       edp_panel_vdd_off(intel_dp, true);

        /* cpu edp my only be disable _after_ the cpu pipe/plane is disabled.
*/
        if (!(port == PORT_A || IS_VALLEYVIEW(dev)))

Or that vdd_off may have to be post-disable.

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