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    <body><span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=108773">bug 108773</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
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         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEEDINFO
           </td>
           <td>RESOLVED
           </td>
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         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>FIXED
           </td>
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      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=108773#c28">Comment # 28</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=108773">bug 108773</a>
              from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
        <pre>(In reply to Johannes Krampf from <a href="show_bug.cgi?id=108773#c27">comment #27</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=144452" name="attach_144452" title="Dmesg of drm-tip fastboot with patch "Do not touch the PCH SSC..."">attachment 144452</a> <a href="attachment.cgi?id=144452&action=edit" title="Dmesg of drm-tip fastboot with patch "Do not touch the PCH SSC..."">[details]</a></span>
> Dmesg of drm-tip fastboot with patch "Do not touch the PCH SSC..."

> I synced to the most recent drm-tip, applied the patch and was able to boot
> with fastboot and graphical output working.

> I've attached the dmesg output with drm.debug=0xe.</span >

Nice. Thanks for testing.

Fix is in:
commit b16c7ed95caf270075c52faad0af8f4cb57ae979
Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Date:   Tue Jun 4 23:09:29 2019 +0300

    drm/i915: Do not touch the PCH SSC reference if a PLL is using it</pre>
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