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    <body><span class="vcard"><a class="email" href="mailto:michel@daenzer.net" title="Michel Dänzer <michel@daenzer.net>"> <span class="fn">Michel Dänzer</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Changing resolution with xrandr causes display to turn off."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=107297">bug 107297</a>
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             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>FIXED
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Changing resolution with xrandr causes display to turn off."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=107297#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - Changing resolution with xrandr causes display to turn off."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=107297">bug 107297</a>
              from <span class="vcard"><a class="email" href="mailto:michel@daenzer.net" title="Michel Dänzer <michel@daenzer.net>"> <span class="fn">Michel Dänzer</span></a>
</span></b>
        <pre>(In reply to iive from <a href="show_bug.cgi?id=107297#c0">comment #0</a>)
<span class="quote">> Something more, it also seems to solve another cosmetics issue that appeared
> after upgrading to xorg 1.20.0 server. Sometimes doing xrandr mode
> switching, the desktop would go black or the image would get corrupted,
> until each desktop elements are redrawn. </span >

That was probably <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [RV710][DRM] Invalid command stream"
   href="show_bug.cgi?id=105381">bug 105381</a>, fixed by the commit you bisected to.

The regression caused by that is already fixed in Git master:

commit 499d2f9d5d301ef1efd4ffc2952677609ef05122
Author: Michel Dänzer <<a href="mailto:michel.daenzer@amd.com">michel.daenzer@amd.com</a>>
Date:   Tue Jul 17 11:43:12 2018 +0200

    glamor: Invalidate cached GEM handle in radeon_set_pixmap_bo</pre>
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