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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW Regression] blank screen on eDP with 38aecea0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76711#c33">Comment # 33</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW Regression] blank screen on eDP with 38aecea0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76711">bug 76711</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>Please *also* try the below test patch on top of current drm-intel-nightly, see
if it works, and attach dmesg.
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 87b0a515d7a5..67fd0ec2b34d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -814,8 +814,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
bpp);
- for (lane_count = 1; lane_count <= max_lane_count; lane_count
<<= 1) {
- for (clock = 0; clock <= max_clock; clock++) {
+ for (lane_count = max_lane_count; lane_count <= max_lane_count;
lane_count <<= 1) {
+ for (clock = max_clock; clock <= max_clock; clock++) {
link_clock =
drm_dp_bw_code_to_link_rate(bws[clock]);
link_avail = intel_dp_max_data_rate(link_clock,
lane_count);</pre>
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