<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BayTrail-M] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67245#c29">Comment # 29</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BayTrail-M] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67245">bug 67245</a>
from <span class="vcard"><a class="email" href="mailto:jbarnes@virtuousgeek.org" title="Jesse Barnes <jbarnes@virtuousgeek.org>"> <span class="fn">Jesse Barnes</span></a>
</span></b>
<pre>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);</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
</ul>
</body>
</html>