[Bug 67245] [BayTrail-M] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67245

--- Comment #29 from Jesse Barnes <jbarnes at virtuousgeek.org> ---
And a patch:

--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1230,9 +1230,7 @@ void ironlake_edp_panel_off(struct intel_dp *intel_dp)
        WARN(!intel_dp->want_panel_vdd, "Need VDD to turn off panel\n");

        pp = ironlake_get_pp_control(intel_dp);
-       /* We need to switch off panel power _and_ force vdd, for otherwise
some
-        * panels get very unhappy and cease to work. */
-       pp &= ~(POWER_TARGET_ON | EDP_FORCE_VDD | PANEL_POWER_RESET |
EDP_BLC_EN
+       pp &= ~(POWER_TARGET_ON | PANEL_POWER_RESET | EDP_BLC_ENABLE);

        pp_ctrl_reg = _pp_ctrl_reg(intel_dp);

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