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    <body><span class="vcard"><a class="email" href="mailto:conselvan2@gmail.com" title="Ander Conselvan de Oliveira <conselvan2@gmail.com>"> <span class="fn">Ander Conselvan de Oliveira</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90963">bug 90963</a>
          <br>
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          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Attachment #119060 is obsolete</td>
           <td>
                
           </td>
           <td>1
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Attachment #119126 is obsolete</td>
           <td>
                
           </td>
           <td>1
           </td>
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      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90963#c17">Comment # 17</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90963">bug 90963</a>
              from <span class="vcard"><a class="email" href="mailto:conselvan2@gmail.com" title="Ander Conselvan de Oliveira <conselvan2@gmail.com>"> <span class="fn">Ander Conselvan de Oliveira</span></a>
</span></b>
        <pre>Created <span class=""><a href="attachment.cgi?id=119195" name="attach_119195" title="Fallback to lower link rate on MST link training failure">attachment 119195</a> <a href="attachment.cgi?id=119195&action=edit" title="Fallback to lower link rate on MST link training failure">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=90963&attachment=119195'>[review]</a>
Fallback to lower link rate on MST link training failure

(In reply to Eong Chen from <a href="show_bug.cgi?id=90963#c15">comment #15</a>)
<span class="quote">> Created <span class="bz_obsolete"><a href="attachment.cgi?id=119126" name="attach_119126" title="full dmesg with <Fallback to lower link rate on MST link training> patch">attachment 119126</a> <a href="attachment.cgi?id=119126&action=edit" title="full dmesg with <Fallback to lower link rate on MST link training> patch">[details]</a></span>
> full dmesg with <Fallback to lower link rate on MST link training> patch

> It shows some crash information. And it doesn't work with my monitor. Sorry
> I didn't read the patch this time. :)</span >

I didn't expect this to fix the problem completely, but to give a clue if the
problem is related to our non-compliant link training implementation.
Unfortunately, there was an error in that patch. Here's a corrected version.

If this produce a line like the following in the log, you can try the patch
below, replacing the number with the one you see in the log, and check if
things work.

[drm:intel_mst_pre_enable_dp] clock recovery succeeded with rate 270000


diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c
b/drivers/gpu/drm/i915/intel_dp_mst.c
index eba5bf9..63fe050 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -57,6 +57,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder
*encoder,
        lane_count = drm_dp_max_lane_count(intel_dp->dpcd);

        rate = intel_dp_max_link_rate(intel_dp);
+       rate = 270000;

        if (intel_dp->num_sink_rates) {
                intel_dp->link_bw = 0;</pre>
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